/unix/misc:

ASCII to PostScript converter with pretty-printing capabilities

The Advanced Bash Scripting Guide - an in-depth exploration of the art of shell scripting (HTML).

The Advanced Bash Scripting Guide - an in-depth exploration of the art of shell scripting (PDF format; roughly 950 pages!).

The Advanced Bash Scripting Guide -an in-depth exploration of the art of shell scripting. Development version (PDF format; roughly 950 pages!).

GNU adns - advanced, easy to use, asynchronous-capable DNS client library (for C and C++ programs) and utilities

Aegis is a transaction-based software configuration management system.

Aegis is a transaction-based software configuration management system. Reference manual (PDF).

Aegis is a transaction-based software configuration management system. User guide (PDF).

Personal Archival E-mail (requires PostgreSQL)

Alpine/Pico/Pilot/Web Alpine/Imapd distribution - basically a screen-oriented message-handling tool (the "pine" successor)

Amanda is a backup system designed to archive many computers on a network to a single large-capacity tape drive

amavisd-new (A Mail Virus Scanner) is a high-performance interface between mailer (MTA) and content checkers: virus scanners, and/or SpamAssassin.

amavisd-new (A Mail Virus Scanner) is a high-performance interface between mailer (MTA) and content checkers: virus scanners, and/or SpamAssassin.

Automatically mount file systems

Automatically mount file systems (test release; Sun-style automount syntax)

A free MS-Word reader - converts the documents from Word 6, 7, 97 and 2000 to ASCII and Postscript (beta release)

argus - Audit Record Generation and Utilization System (a generic IP network transaction auditing and management tool)

argus - Audit Record Generation and Utilization System (a generic IP network transaction auditing and management tool). Programs that read, parse and process Argus data.

arpwarch is a ethernet monitor program for keeping track of ethernet/ip address pairings,

Monitors Ethernet or FDDI network traffic and builds databases of Ethernet/IP address pairs (next generation version)

A More Intelligent Ispell (spell checker)

A More Intelligent Ispell (spell checker)

A More Intelligent Ispell (spell checker)

Asterisk is a complete PBX (Private Branch eXchange) telephony engine and telephony applications toolkit (supports Voicemail services with Directory, Call Conferencing, Interactive Voice Response and Call Queuing, ...). 1.4 series release.

Asterisk is a complete PBX (Private Branch eXchange) telephony engine, and telephony applications toolkit (supports Voicemail services with Directory, Call Conferencing, Interactive Voice Response and Call Queuing, ...). 1.6 series release (no longer supports Zaptel but only DAHDI).

ATK is a API (toolkit) for GNOME/GTK+ Accessibility

The ATLAS (Automatically Tuned Linear Algebra Software) project is an ongoing research effort focusing on applying empirical techniques in order to provide portable performance.

The ATLAS (Automatically Tuned Linear Algebra Software) project is an ongoing research effort focusing on applying empirical techniques in order to provide portable performance. Developer version.

AUCTEX is an extensible package for writing and formatting TeX files in GNU Emacs and XEmacs.

GNU Autoconf is an extensible package of M4 macros that produce shell scripts to automatically configure software source code packages.

AutoGen is automated text file generator to simplify the creation and maintenance of programs that contain large amounts of repetitious text (documentation only)

AutoGen is an automated text file generator to simplify the creation and maintenance of programs that contain large amounts of repetitious text (for e.g. for options processing)

GNU Automake is a Makefile generator (input Makefile.am, output Makefile.in; intended for use with autoconf)

GNU libavl is a library in ANSI/ISO C for manipulation of binary trees and balanced binary trees (to find a particular item in an ordered data set)

Babel is a language interoperability tool intended for use by the high-performance scientific computing community that supports the Scientific Interface Definition Language (SIDL) for the language-independent declaration of interfaces associated with scientific software packages (latest development release).

Babel is an IDL-based interoperability tool specific to engineering and scientific applications (users guide; PDF format).

Bacula is a network client/server based backup program

BASH - GNUs Bourne Again Shell

GNU Bayonne 1 is a script driven threaded state-event multi-line telephony server for creating voice response applications, such as automated attendant, call distribution, announcements and voice messaging.

GNU Bayonne 2 is a second generation telephony application server with a special focus on SIP.

GNU Bayonne 2 is a second generation telephony application server with a special focus on SIP. Release candidate.

An arbitrary precision numeric processing language (development version)

An arbitrary precision numeric processing language

C(++) Beautifier

BerkeleyDB is a module which allows Perl programs to make use of the facilities provided by Berkeley DB (version 2 or greater)

BEYE (Binary EYE) is a portable, advanced viewer of binary files with built-in editor for binary, hexadecimal and disassembler modes. (project name was changed from BIEW into BEYE)

GNU Binutils are a collection of binary tools. The main ones are "ld" the GNU linker and "(g)as" the GNU assembler.

Bison is a general-purpose parser generator.

A file distributing tool (newer Windows only versions may run under Wine).

A file distributing tool (newer Windows only versions may run under Wine).

A file distributing tool (newer Windows only versions may run under Wine).

An extension to the Tk toolkit. It adds plotting widgets (X-Y graph, barchart, stripchart), a powerful geometry manager, a new canvas item, and several new commands to Tk.

bochs is a portable open source IA-32 (x86) PC emulator of the Intel x86 CPU, common I/O devices, and a custom BIOS. Bochs is capable of running most Operating Systems inside the emulation including Linux, DOS, Windows 95/98, NT/2000/XP or Vista.

Bogofilter is a learning spam mail filter using Bayesian (statistical) analysis for classification.

Bonita is an XPDL standard compliant workflow and Business Process Management (BPM) solution

Boost provides free peer-reviewed portable high-quality C++ source libraries.

Bugzilla is an advanced "Defect Tracking System" or "Bug-Tracking System". Stable release.

Bugzilla is an advanced "Defect Tracking System" or "Bug-Tracking System". Latest release.

A block-sorting file compressor

Bazaar is a decentralized revision control system (GNU project, written in Python).

cairo is a 2D vector graphics library with support for multiple output devices (X11, Windows-API Win32, image buffers and other experimental backends like PostScript and PDF).

Calc - C-style arbitrary precision calculator

The Common Data Format (CDF) is a self-describing data format for the storage and manipulation of scalar and multidimensional data in a platform- and discipline-independent fashion.

Cdrtools - Highly portable CD/DVD/BluRay command line recording software. Recent version.

Celestia is a real-time space simulation that lets you experience our universe in three dimensions (OpenGL-based).

Cfengine 2 is language based tool specifically designed for configuring and maintaining BSD and System-5-like operating systems (workstations) attached to a TCP/IP network.

Cfengine 3 is a configuration management system for configuring and maintaining Unix-like computers (using an own high level policy language).

Analyzes a collection of C source files and prints a graph, charting control flow within the program

Chroot applications in a sane and safe manner

A motion picture editing tool primarily used for painting and retouching of movie images (was "filmgimp").

Clam AntiVirus is an anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways. It provides a multi-threaded daemon, a command line scanner, and an advanced tool for automatic database updating via Internet.

Claws Mail is an email client (and news reader), based on GTK+ (previously known as Sylpheed-Claws)

Claws Mail is an email client (and news reader): Extra Plugins (like an RSS aggregator, calendar, or laptop LED handling)

Coda - a distributed file system like NFS and AFS

Common C++ 2 is a C++ framework offering portable support for threading, sockets, file access, daemons, persistence, serial I/O, XML parsing, and system services.

Compress and expand 48x48x1 face image files

GNU Core Utilities are the basic file, shell and text manipulation utilities of the GNU Operating System.

An ISO 3166 country code finder

The Courier mail transfer agent (MTA) is an integrated mail/groupware server that provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework.

The Courier IMAP server is a scalable, enterprise IMAP server that uses Maildirs.

Query, download and build perl modules from CPAN (Comprehensive Perl Archive Network) sites

GNU cpio, a program to manage archives of files

A program that generates function prototypes and variable declarations from C source code

Monitor and visualize (network) trends in time-series data (using "rrdtool")

A graphical Interface for the cvs client commandline tool on the Unix, Windows and Mac OS X platform (old name: LinCVS). Hint: You may look for newer versions 2.x that have another license and are no longer freely distributable.

A text screen based source browsing tool (C, C++)

The Common UNIX Printing System (CUPS) provides a portable printing layer for UNIX operating systems using Internet Printing Protocol (IETF-IPP) as basis for managing print jobs and queues. LPD and SMB and AppSocket protocols are supported with reduced functionality.

Concurrent Versions System - a front end to the rcs revision control system ("stable release")

Concurrent Versions System - a front end to the rcs revision control system ("feature release")

Cyrus IMAP (Internet Message Access Protocol) Server. Latest legacy release.

Cyrus IMAP (Internet Message Access Protocol) Server. Latest stable/current release.

Cyrus IMSP (Interactive Mail Support Protocol) Server (to manage multiple IMAP servers and ...)

Cyrus SASL (Simple Authentication and Security Layer) API implementation (see RFC 2222).

Cyrus SASL (Simple Authentication and Security Layer) API implementation (see RFC 2222).

A collection of tools for managing UNIX services

Dante is a circuit-level firewall/proxy (socks server).

DataFinder is is a light-weight tool for managing large sets of scientific and technical data (a variety of data storage interfaces are supported e.g. WebDAV, FTP, GridFTP, OpenAFS, or TSM).

Oracle Berkeley DB - high performance embeddable database engine (without cryptography)

Oracle Berkeley DB - high performance embeddable database engine (with AES encryption)

A module which allows Perl programs to make use of the facilities provided by Berkeley DB version 1.

Data Display Debugger (DDD), a common graphical front-end for command-line debuggers such as GDB, DBX, WDB, Ladebug, JDB, XDB, the Perl debugger, or the Python debugger

DejaGnu is a framework for testing other programs

DeleGate - a multi-purpose application level gateway, or a proxy server. DeleGate mediates communication of various protocols (HTTP, FTP, NNTP, SMTP, POP, IMAP, LDAP, Telnet, SOCKS, DNS, etc.), applying cache and conversion for mediated data, controlling access from clients and routing toward servers (stable version)

ISC DHCP implements the "Dynamic Host Configuration Protocols" for connection to a local network (version 4.1.x, current production release)

ISC DHCP implements the "Dynamic Host Configuration Protocols" for connection to a local network (version 4.2.x, development release).

di is a portable disk information utility, displaying everything (and more) that df does with different formats

A backbone news transit system, designed to replace INN on backbone machines.

dictd is a client/server software implementing the Dictionary Server Protocol (DICT)

Prints wordy and commonly misused phrases, analyses surface characteristics of a document.

diffutils - GNU diff, diff3, sdiff and cmp utilities

Dmalloc is a debug memory allocation library.

Various Domain Name Service (DNS) utilities

Dovecot is an IMAP and POP3 server, written with security primarily in mind.

Doxygen is a source code documentation generator tool for C++, C, Java, Objective-C, Python, IDL (Corba and Microsoft flavors), Fortran, VHDL, PHP, C#, and to some extent D. Different output formats are supported.

OpenDX is an application and development software package for visualizing data, especially 3D data from simulations or acquired from observations (based on IBM's Visualization Data Explorer).

dxpc is an X protocol compressor designed to improve the speed of X11 applications run over low-bandwidth links.

OpenDX - Open Data Explorer based on IBM's scientific data visualization software. Samples.

Test a remote host with TCP "echo" (or other protocol) packets

Electric VLSI Design System

GNU Electric is a sophisticated electrical CAD system that can handle many forms of VLSI circuit design (written in Java).

Elm ME+ is an interactive screen-oriented mail system, Millennium Edition.

ELM is an interactive screen-oriented mail system.

ELS is an Enhanced LS look-alike with many additional features

GNU Emacs - the extensible, customizable, self-documenting real-time display editor.

Programming in Emacs Lisp: An Introduction (texinfo)

A command line SMTP client supporting attachments, SMTP authentication, encryption, personalized signatures, ...

GNU enscript - convert text files to PostScript, HTML, RTF, ANSI, and overstrikes

ePiX, a collection of batch utilities that, creates mathematically accurate figures, plots, and movies using easy-to-learn syntax. The output is expressly suitable for use with LaTeX. Manual and sample files only.

ePiX, a collection of batch utilities that, creates mathematically accurate figures, plots, and movies using easy-to-learn syntax. The output is expressly suitable for use with LaTeX.

Converts files from EPS format (Encapsulated PostScript) to some popular image formats (using GhostScript).

Euler is a program for quickly and interactively computing with real and complex numbers and matrices supporting 2D and 3D plots (requires GTK+). Hint: The most recent version of Euler runs only in Windows (or under Linux in Wine).

Exim is a message transfer agent (MTA).

Exim is a message transfer agent (MTA). Documentation.

A Tcl/Tk based graphical user interface to the MH mail system

Expect performs programmed dialogue with other interactive programs for automating interactive applications.

\*Extrema is visualization and data analysis tool for researchers

A folding editor

FElt is a finite element analysis system.

The Festival Speech Synthesis System

Fetchmail is a full-featured, remote-mail retrieval and forwarding utility. It supports POP2, POP3, RPOP, APOP, KPOP, all flavors of IMAP, ETRN, ODMR, and even IPv6 and IPSEC.

FFmpeg is a complete, cross-platform solution to record, convert and stream audio and video (including the audio/video codec library "libavcodec").

FFTW is a collection of fast C routines for computing the discrete Fourier transform (DFT) in one or more dimensions. It includes complex, real, symmetric, and parallel transforms, and can handle arbitrary array sizes efficiently

A program that creates large characters out of ordinary screen characters

file determines file type (via magic file)

GNU Find Utilities are basic directory searching utilities: find, locate, uodatedb and xargs

GNU Find Utilities are basic directory searching utilities: find, locate, uodatedb and xargs Development version.

Fityk is a general-purpose nonlinear curve-fitting and data analysis program. It allows data visualization, separation of overlapping peaks, background subtraction, data calibration and much more.

flex: The Fast Lexical Analyzer

FLTK (Fast Light Tool Kit) - a cross-platform C++ GUI toolkit for UNIX/Linux (X11), Microsoft Windows, and MacOS X.

FOX is a C++ based Toolkit for developing Graphical User Interfaces

FOX is a C++ based Toolkit for developing Graphical User Interfaces (development version)

Free Pascal (aka FPK Pascal) is a 32-bit/64-bit pascal compiler for different platforms. The language and the runtime library are almost compatible with Turbo Pascal 7.0 and recent Delphi releases (with the documentation and all necessary tools to build the official releases).

Framewave is a collection of popular image and signal processing routines designed to accelerate application development, debugging, and optimization on x86-class processor platforms (derived from the AMD Performance Library; source code).

FreeIPA is an integrated security information management solution combining Linux (Fedora), 389 (formerly known as Fedora Directory Server), MIT Kerberos, NTP, and DNS.

FreeIPA is an integrated security information management solution combining Linux (Fedora), 389 (formerly known as Fedora Directory Server), MIT Kerberos, NTP, and DNS.

FreeMat is a free environment for rapid engineering and scientific prototyping and data processing (similar to MATLAB and GNU Octave). It provides visualization, image manipulation, and plotting as well as parallel programming.

FreeRADIUS Client is a framework and library for writing RADIUS clients

FreeRADIUS Server Project - a high performance and highly configurable RADIUS server

A Tcl formatting program

Fortran 77 program checker - documentation (PDF)

Fortran 77 program checker (detecting unused, uninitialized, and undeclared variables)

GANTT project - Gantt chart based project scheduling and management tool.

GANTT project - Gantt chart based project scheduling and management tool.

A Java-based portable and customizable network directory management system (a kind of metadirectory system supporting NIS, DNS, Netinfo, LDAP ...)

A Java-based portable and customizable network directory management system (a kind of metadirectory system supporting NIS, DNS, Netinfo, LDAP ...) - Release 2.0

GNU awk - pattern scanning and processing language GNU awk - pattern scanning and processing language. Documentation (DVI).

GNU awk - pattern scanning and processing language GNU awk - pattern scanning and processing language. Documentation (PostScript).

GNU awk - pattern scanning and processing language

A multiple mailbox "biff" program (requires GTK+)

Gcal displays month/year calendar sheets, eternal holiday and fixed date lists in many ways

GCC - The GNU Compiler Collection is an integrated GNU compiler system for C, C++, Objective C, Chill, Fortran and Java (GCJ). Snapshot of the oldest maintained release series.

GCC - The GNU Compiler Collection is an integrated GNU compiler system for C, C++, Objective C, Chill, Fortran and Java (GCJ). Oldest maintained release series.

GCC - The GNU Compiler Collection is an integrated GNU compiler system for C, C++, Objective C, Chill, Fortran and Java (GCJ). Snapshot of the previous release series.

GCC - The GNU Compiler Collection is an integrated GNU compiler system for C, C++, Objective C, Chill, Fortran and Java (GCJ). Previous release series.

GCC - The GNU Compiler Collection is an integrated GNU compiler system for C, C++, Objective C, Chill, Fortran and Java (GCJ). Current release series.

GCC - The GNU Compiler Collection is an integrated GNU compiler system for C, C++, Objective C, Chill, Fortran and Java (GCJ). Snapshot of the current release series.

GCC - The GNU Compiler Collection is an integrated GNU compiler system for C, C++, Objective C, Chill, Fortran and Java (GCJ). Snapshot of the active development version.

GCL (GNU Common Lisp) is a compiler and interpreter for Common Lisp.

GDB is the GNU Project source-level debugger that let you see what is going on inside another program while it executes.

gdbm - the GNU database manager. Includes dbm and ndbm compatability.

An interactive geometry viewing program

getmail retrieves messages from one or more POP3, IMAP4, or SDPS mailboxes and deliver to a maildir, mboxrd-format mbox file, or external MDA (written in Python)

GNU gettext utilities - a set of tools that provides a framework to help other GNU packages produce multi-lingual messages (national language support).

GGobi is an visualization program for exploring high-dimensional data.

Ghostscript GNU + Aladdin PostScript interpreters

gif2png is a GIF to PNG graphics file converter (preserving all graphic information, including transparency).

Gifsicle is a UNIX command-line tool for creating, editing, and getting information about GIF images and animations.

GIMP - The GNU Image Manipulation Program

GIMP - The GNU Image Manipulation Program. Development snapshot.

GIMP User Manual (written for the GIMP Help Browser, but can produce help pages for other formats as well).

GiNaC (GiNaC is Not a CAS (Computer Algebra System)) is a C++ library for symbolic calculations.

Git- a fast version control system respectively distributed source code management tool (designed to handle absolutely massive projects like the Linux kernel)

Glade - a User Interface Designer for GTK+ & Gnome

GLib - low-level core C library used by GTK+ and GNOME.

GLib - low-level core C library used by GTK+ and GNOME. Development release.

The GNU C Library ("system calls" and other basic facilities such as open, malloc, printf, exit...)

The glibc ports repository, an add-on for the GNU C Library (glibc). It contains code that is not maintained in the official glibc source tree.

GLPI - IT and Asset Management Software (Information Resource-Manager)

GLPK (GNU Linear Programming Kit) is intended for solving large-scale linear programming (LP), mixed integer programming (MIP), and other related problems. linear programming problems by means of the revised simplex method.

GMP (GNU Multiple Precision) is a library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers. Stable release.

GMP (GNU Multiple Precision) is a library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers. Performance release.

GMT - The Generic Mapping Tools for manipulating geographic and Cartesian data sets

GNATS (GNU Problem Report Management System) is a set of tools for tracking bugs reported by users to a central site.

Gnatsweb is a web front-end to gnats, the GNU Problem Report Management System.

GNU Interactive Tools (file system browser, process viewer/killer, hex/ascii file viewer)

GnuPG - The GNU Privacy Guard (tool for secure communication and data storage). GnuPG-1 - the well known and portable standalone version".

GnuPG - The GNU Privacy Guard (tool for secure communication and data storage). GNUPG-2 - the enhanced and somewhat harder to build version (compared to GnuPG-1).

Gnuplot is a portable command-driven interactive function plotting program (documentation; PDF format).

Gnuplot is a portable command-driven interactive function plotting program.

Gnus is the advanced, self-documenting, customizable, extensible unreal-time newsreader for GNU Emacs.

GnuTLS (GNU Transport Layer Security Library) implements the TLS 1.1 and SSL 3.0 protocols accompanied with the required framework for authentication and public key infrastructure.

GNU Pascal Compiler (GPC) (hlp ipf ms nroff rnh).

GNU General Public License - Version 1, February 1991 (plain text format)

GNU General Public License - Version 2, June 1991 (plain text format)

GNU General Public License - Version 3, 29 June 2007 (plain text format)

GRACE - GRaphing, Advanced Computation and Exploration of data (a WYSIWYG 2D plotting tool, a descendant of and replacement for ACE/gr respectively xmgr)

GRACE - GRaphing, Advanced Computation and Exploration of data (a WYSIWYG 2D plotting tool, a descendant of and replacement for ACE/gr respectively xmgr) - development version

Graphviz - a set of graph drawing tools and libraries

GRASS (Geographic Resources Analysis Support System) is a raster- and vector-based GIS, image processing system, graphics production system and spatial modeling system.

GRASS (Geographic Resources Analysis Support System) is a raster- and vector-based GIS, image processing system, graphics production system and spatial modeling system (technology preview release, testing version).

GRASS (Geographic Resources Analysis Support System) is a raster- and vector-based GIS, image processing system, graphics production system and spatial modeling system (release candidate of next stable version).

A framework for testing other programs and libraries (requires guile)

GNU grep prints lines containing a match to a specified pattern.

Grepmail - search for emails in a normal or compressed mailbox using a regular expression or date constraint (Perl)

GNU groff document formatting system

Groovy is an agile dynamic (scripting) language for the Java Platform. It has features similar to those of Python, Ruby, Perl, and Smalltalk. Binary release.

Groovy is an agile dynamic (scripting) language for the Java Platform. It has features similar to those of Python, Ruby, Perl, and Smalltalk. JavaDoc and online documentation.

Groovy is an agile dynamic (scripting) language for the Java Platform. It has features similar to those of Python, Ruby, Perl, and Smalltalk. Source release.

GNU GRUB 2 - a multiboot boot loader (development version)

GNU SASL is an implementation of the Simple Authentication and Security Layer (SASL).

GNU SASL is an implementation of the Simple Authentication and Security Layer (SASL). Development version.

GSL (GNU Scientific Library) is a numerical library for C and C++ programmers.

GSL (GNU Scientific Library) is a numerical library for C and C++ programmers.

GTK+ ,the GIMP Toolkit, is a library for creating graphical user interfaces for the X Window System

GTK+ , the GIMP Toolkit, is a library for creating graphical user interfaces for the X Window System (current development series)

GtkExtra is a widget set complementary to GTK+ for creating GUI's for the X Window System (scientific graphics, ...)

The Perl-Gtk interface

GNU Typist - a typing tutor

Guile is GNU's extension language library. Guile is an interpreter for Scheme, packaged as a library that you can link into your applications to give them their own scripting language.

Guile is GNU's extension language library. Guile is an interpreter for Scheme, packaged as a library that you can link into your applications to give them their own scripting language (development version).

Gutenprint (Gimp-Print) is a collection of very high quality printer drivers for UNIX/Linux (plugins for GIMP2, driver for CUPS and GhostScript)

gv is an X11 ghostscript frontend (based on ghostview)

GNU Gzip is a data compression program

h5utils is a set of utilities for visualization and conversion of scientific data in the free, portable HDF5 format.

HDF5 (NCSA's Hierarchical Data Format 5) - a library and file format for storing scientific data (note: HDF5 and old HDF versions are NOT compatible; old stable release)

HDF5 (NCSA's Hierarchical Data Format 5) - a library and file format for storing scientific data (note: HDF5 and old HDF versions are NOT compatible; current stable release; source)

HDF5 (NCSA's Hierarchical Data Format 5) - a library and file format for storing scientific data (documentation of current stable release)

HDF5 (NCSA's Hierarchical Data Format 5) - a library and file format for storing scientific data (documentation of development branch)

HDF5 (NCSA's Hierarchical Data Format 5) - a library and file format for storing scientific data (development branch)

HDF5 (NCSA's Hierarchical Data Format 5) - a library and file format for storing scientific data: tutorial

Heap Layers: An Extensible Memory Allocation Infrastructure (incorporating Hoard)

Heimdal is a free implementation of Kerberos 5 (a system for authenticating users and services on a network).

help2man is a tool for automatically generating simple manual pages from the --help and --version output of programs.

The Hoard memory allocator is a drop-in replacement for malloc() that can improve application performance, especially for multithreaded programs running on multiprocessors (hint: newer releaseis now part of the HeapLayers package).

A complete and powerful command-line based DNS query and testing tool. A nameserver query utility a la 'nslookup' and 'dig' but with more extensive testing and test automation features.

HP-GL converter

HylaFAX+ is a system for sending and receiving facsimiles as well as for sending alpha-numeric pages (fax server).

HylaFAX is a system for sending and receiving facsimiles as well as for sending alpha-numeric pages (fax server).

The IANA /etc files package ("services" and "protocols")

Icecast is an internet streaming audio system.

ICU IBM's International Components for Unicode (ICU) - user guide (PDF format and other)

ICU IBM's International Components for Unicode (ICU) - C and C++ library documentation (stable release; HTML format)

ICU - IBM's International Components for Unicode (ICU) is a C and C++ library that provides robust and full-featured Unicode support on a wide variety of platforms (stable release).

ICU IBM's International Components for Unicode (ICU) - C and C++ library documentation (milestone release; HTML format)

ICU IBM's International Components for Unicode (ICU) is a C and C++ library that provides robust and full-featured Unicode support on a wide variety of platforms (milestone release).

GNU ID Utils is a binary file containing a list of file names, a list of tokens, and a sparse matrix indicating which tokens appear in which files (for e.g. to make many text-searching tasks simpler and faster).

Universal Print Filter for PostScript and HP printers, as well as the usual 'dumb' printers (for BSD based print spoolers, for e.g. used by LPRng)

ExifTool is a platform-independent Perl library plus a command-line application for reading, writing and editing meta information in image, audio and video files

ImageMagick is a collection of tools and libraries to display and manipulate an image in many image formats

IMAL (Image Analysis and Measurement Lab) - a scientific image analysis program that allows you to create, edit, analyze, and produce color prints of images (formerly tnimage).

UW IMAP Toolkit Environment including sources for imapd server, pop2 and pop3 servers, and c-client library

GNU Indent changes the appearance of a C program by inserting or deleting whitespace.

Inetutils is a distribution of common networking utilities and servers (ftp, tftp, telnet, rsh, rlogin ane more ...)

Inkscape is a Scalable Vector Graphics editor - a powerful drawing tool using the W3C standard Scalable Vector Graphics (SVG) file format.

INN (InterNetNews) is a complete Usenet system. It includes innd, an NNTP server, and nnrpd, a newsreading server.

International X11 fonts (BDF format) for all characters that Emacs 20 can handle

IP packet filtering (for both inbound and outbound traffic)

Implicit Queuing System - manages cpu-hogging jobs

IRC (Internet Relay Chat) client

A collection of programs, that enables the use of the IrDA protocols (to communicate with remote devices usinge infrared wireless communication)

IRODS (the integrated Rule Oriented Data System) is a distributed data-management system for creating data grids, digital libraries, persistent archives, and real-time data systems.

iSelect is a (n)curses-based tool for interactive line selection in an ASCII file via a full-screen terminal session.

Fast screen-oriented spelling checker (an unofficial release which adds support for the -e5 option and has some fixes)

Fast screen-oriented spelling checker An interactive spell-checking program

The source distribution contains all of the Java files used to create Jacl. This is useful for those who wish to tightly integrate Jacl with their Java applications or for those who wish to help with the porting effort.

Jacl (Java Command Language) is a 100% Java implementation of Tcl 8.x. Binary distribution.

The Jargon File, a comprehensive compendium of hacker slang illuminating many aspects of hackish tradition, folklore and humor.

A highly effective data compression algorithm for bi-level high-resolution images

JCIFS is a client library that implements the CIFS/SMB networking protocol in 100% Java (CIFS is the standard file sharing protocol on the Microsoft Windows platform).

JED is a text editor (syntax highlighting, extensible in the C-like S-Lang scripting language).

joe (Joe's Own Editor) with a GNU-Emacs imitation (key-sequences are reminiscent of WordStar and Turbo-C)

Convert JPEG compressed images to PostScript Level 2

An improved Whois client

Shell for computational algebraic number theory with pascal-like programming language (SunOS binary)

Shell for computational algebraic number theory with pascal-like programming language (common data files)

Shell for computational algebraic number theory with pascal-like programming language (Linux binary)

Koha is a Integrated Library System (ILS)

Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography (MIT implementation) - maintenance release

Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography (MIT implementation) - current release

LAME is a high quality MPEG Audio Layer III (MP3) encoder.

LAPACK - Linear Algebra PACKage. A transportable library of Fortran 77 subroutines for solving the most common problems in numerical linear algebra: systems of simultaneous linear equations, least-square solutions of linear systems of equations, eigenvalue problems, and singular value problems.

LaTeX2rtf is a LaTeX to RTF converter.

The Lazarus IDE is a visual programming environment for the FreePascal Compiler (fpc). It supports the creation of self-standing graphical and console applications and runs on Linux, FreeBSD, MacOSX and Windows.

Leafnode is a store & forward NNTP proxy for small (dialup) sites.

The Emacs Lisp code for input methods for various international character scripts

less is a file pager (a program that displays text files similar to "more" or "pg")

lesspipe is an input filter for the pager "less" to view files with binary content, compressed files, archives and files contained in archives.

The OSF/Motif Clone ... (source)

lftp is a command line ftp client (FTP, HTTP, ssl support, background transfer, reget, reput, ...)

GNU Lesser General Public License - Version 3, 29 June 2007 (formerly known as Library GPL; plain text format)

LHa compression/decompression for UNIX

A C Foundation Library that simplify systems software development on System V UNIX (includes routines for memory management, string parsing, filesystem traversal, subprocess execution, I/O, ...)

OPeNDAP is a client/server system for making local data accessible to remote locations without regard to the local or remote storage format, architecture, or environment (see also ODC = The OPeNDAP Data Connector).

Libgcrypt - The general purpose GNU crypto library

LibGGI (General Graphics Interface) library - a flexible drawing library (see also LibGII)

LibGII (General Input Interface) - API for all possible input sources (see also LibGGI)

DNU libiconv is a character set conversion library (using Unicode).

The reference library for MNG, the animation extension to the popular PNG format

LibNcFTP: is a FTP client library to build custom applications that use the File Transfer Protocol (FTP).

A nonblocking I/O, and OO library (used by syslog-ng)

libpcap is a packet filter library used by tools like tcpdump.

libpng is the reference library supporting the PNG graphic file format

libpng is the reference library supporting the PNG graphic file format

libpng is the reference library supporting the PNG graphic file format (beta version)

libpng is the reference library supporting the PNG graphic file format (beta version)

libsigc++ implements a typesafe callback system for standard C++ (used by gtkmm to wrap the GTK+ signal system).

GNU libtool is a generic library support script that hides the complexity of using shared libraries behind a consistent, portable interface.

Logging and access control in tcp wrapper style for rlogind, rshd, login, rexecd, ftpd, telnetd, ...

A document formatting system (producing plain text, PostScript or PDF)

A document formatting system (producing plain text, PostScript or PDF)

An enhanced, extended, and portable implementation of the Berkeley LPR print spooler functionality (LPRng "Patrick Powell")

An enhanced, extended, and portable implementation of the Berkeley LPR print spooler functionality (LPRng SourceForge Project)

LSH - a GNU implementation of the Secure Shell protocols (ssh)

LSOF - LiSt Open Files for running UNIX processes

A fast, light-weight, embeddable scripting language designed for extending applications

LyX is an advanced document processor that produces high quality, professional output using LaTeX, an industrial strength typesetting engine, in the background.

Lzip is a lossless file compressor based on the LZMA algorithm. It decompresses almost as fast as gzip and compresses better than bzip2, but requires more memory and time during compression.

Lzip is a lossless file compressor based on the LZMA algorithm. It decompresses almost as fast as gzip and compresses better than bzip2, but requires more memory and time during compression.

A real-time data compression library

GNU M4 is an implementation of the traditional Unix macro processor.

Cross-platform mail and news client - supports POP3, IMAP and full MIME support (using wxWindows building on the gtk toolkit on Unix)

maildrop is a mail delivery agent with filtering abilities (similar to procmail)

Mailman - The GNU Mailing List Management System (requires Python 2.4 or later)

SpamAssassin is a mail filter that uses a wide range of heuristic tests on mail headers and body text to identify "spam" (also known as unsolicited commercial email) incl. Bayesian (statistical) spam filter and several internet-based realtime blacklists.

The GNU Mailutils is a protocol-independent mail framework containing a POP3 server, an IMAP4 server, a Sieve mail filter, a POSIX `mailx' client, and a collection of other tools.

Heirloom mailx is a mail user agent (derived from Berkeley Mail) with MIME extensions (info: formerly known as "nail")

GNU make utility is a tool which controls the generation of executables and other non-source files of a program from the program's source files.

A make file system for easy concurrent compilation of source code on a wide (expandable) number of platforms

GNU MARST - Algol-to-C Translator

Mathomatic is a portable text mode Computer Algebra System (CAS).

MAVERIK is a system for managing graphics and interaction in Virtual Reality applications. It is designed to address the challenges of highly interactive virtual environments containing many objects with complex geometry (using either Mesa or OpenGL to perform rendering).

MAVERIK Virtual Reality demos

Maxima is a Lisp based computer algebra system (doing mathematics calculations, symbolic manipulations, numerical computations and graphics)

GNU Midnight Commander is a feature rich full-screen text mode file manager.

An ANSI C fault tolerant memory leak and corruption detection tool

Mercurial is a Source (Version) Control Management system designed for efficient handling of very large distributed projects

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interactive 3D graphics (demos).

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interactive 3D graphics (demos). Current release.

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interactive 3D graphics (main library code).

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interactive 3D graphics (main library code). Current release.

Send and receive faxes using a class 2.0 or 2 faxmodem (with voice call handling)

A freely available and fully compliant implementation of the CORBA standard (Common Object Request Broker Architecture) that enables software components written in multiple computer languages and running on multiple computers to work together.

MIMEDefang uses sendmail's milter interface to intercept, inspect, and modify email messages as they travel through the sendmail server. It can be combined with other mail scanning software for spam filtering, virus scanning, etc.

Miro is a video player and podcast client. It supports most known video files and offers sound and video, some in HD quality.

Mirrors a directory tree in every detail, suitable for timed backups of disk drives

GNU miscellaneous files distribution

MM - Shared Memory Library

MongoDB is a high-performance, dynamic-schema, document-oriented (NoSQL) database combining the best features of JSON databases, key-value stores, and RDBMSes.

Mono - a development and runtime environment for .NET client and server applications on Linux, Solaris, Mac OS X, Windows, and Unix.

Modular Object Oriented Dynamic SpreadSheet (Tcl/Tk)

A graphical modular monitoring application (Tcl/Tk)

Browse or page through a text file

mpack/munpack - utilities for encoding and decoding binary files in MIME (Multipurpose Internet Mail Extensions) format mail messages

Pretty printing of ASCII files on PostScript printers ("Sun"-like)

MPICH2 is an all-new implementation of MPI (Message Passing Interface) that is intended to support research into the implementation of both MPI-1 and MPI-2.

MPlayer is a Unix movie player that can play most standard video formats out of the box and almost all others with the help of external codecs.

MRTG - The Multi Router Traffic Grapher (generates HTML pages monitor the traffic load on network-link

Mtools is a collection of utilities to access MS-DOS disks from Unix without mounting them.

Munin is a tool for graphing all sorts of information about one or more servers and displaying it in a web interface (requires Perl and RRDTool).

A mail client-reader (pop3, mailcap, and color support) - stable version

A mail client-reader (pop3, mailcap, and color support) - development version

MySQL - a SQL (Structured Query Language) database server ("old" production release)

MySQL - a SQL (Structured Query Language) database server (GA release for production use)

An ODBC 3.5x (Open Database Connectivity) compliant driver for MySQL database server ("MyODBC")

MySQL GUI Tools Bundle (MySQL Administrator, MySQL Query Browser, MySQL Migration Toolkit, MySQL Workbench)

MySQL (SQL database server) Reference Manuals (different versions and formats; languages: en + de)

Nagios is an host/service/network monitoring system to identify and resolve IT infrastructure problems

Plugins for the Nagios host/service/network monitoring program

Nano is ANOther display-oriented text editor (an enhanced free clone of Pico from the Pine project)

The Network Audio System (NAS)

NcFTP is a set of application (client) programs implementing the File Transfer Protocol (FTP).

NCO (netCDF Operators) are a suite of programs known as operators. The operators facilitate manipulation and analysis of self-describing data stored in the netCDF or HDF formats.

The ncurses (new curses) library is a freeware emulation of System V Release 4.0 curses

ncview is a X11 visual browser for netCDF data format files

ncview is a X11 visual browser for netCDF data format files

ne - The nice editor

NEdit is a multi-purpose text editor (X11 Motif)

NetCDF (network Common Data Form) is a set of software libraries and machine-independent data formats that support the creation, access, and sharing of array-oriented scientific data.

NetCDF (network Common Data Form) is a set of software libraries and machine-independent data formats that support the creation, access, and sharing of array-oriented scientific data.

Netpbm is a toolkit for conversion of images between a variety of different formats, as well as to allow a few basic image operations (a successor to Jef Poskanzer's PBMPlus package) - super stable version

netperf+ is a network performance benchmark (TCP/UDP/DLPI/Sockets/SCTP).

Net-SNMP contains various tools relating to the Simple Network Management Protocol (successor of the cmu-snmp library).

Net-SNMP contains various tools relating to the Simple Network Management Protocol (successor of the cmu-snmp library).

A portable and enhanced version of syslog

network grep - applies GNU grep's common features to the network layer

Nmap ("Network Mapper") is a utility for network exploration or security auditing (port scanner).

Nmap ("Network Mapper") is a utility for network exploration or security auditing (port scanner). Defcon release (BETA).

nmh (new MH) is an electronic mail handling system.

Examine network printer information (using SNMP)

Analyzes the networks streams (dumped by tcpdump)

ntop is a network usage monitor (based on libpcap)

NTP - the Network Time Protocol (Version 4)

NUT (Network UPS Tools) - monitoring and administering UPS (Uninterruptible Power Supply) and PDU hardware

Octave is a high-level language for linear and nonlinear numerical computations mostly compatible with Matlab (note: Octave 3.x is significantly different from Octave 2.1)

Octave is a high-level language for linear and nonlinear numerical computations mostly compatible with Matlab ("bleeding edge" - development version)

The OPeNDAP Data Connector (ODC) allows to search for and retrieve datasets published by OPeNDAP data servers (for e.g. climatic data, satellite imagery, and ocean sensor results).

... a collection of almost obsolete or out-dated software archives

omniORN is a robust high performance CORBA ORB for C++ and Python (CORBA = Common Object Request Broker Architecture).

ooRexx (Open Object Rexx) is a free implementation of Object Rexx. Object Rexx is an enhancement of the classic Rexx interpreter; a full-featured programming language with a human-oriented syntax.

OpenAFS is a distributed filesystem. It offers a client-server architecture for file sharing, providing location independence, scalability and transparent migration capabilities for data (documentation).

OpenAFS is a distributed filesystem. It offers a client-server architecture for file sharing, providing location independence, scalability and transparent migration capabilities for data. Maintenance release.

OpenAFS is a distributed filesystem. It offers a client-server architecture for file sharing, providing location independence, scalability and transparent migration capabilities for data (development version believed to be stable; documentation).

OpenAFS is a distributed filesystem. It offers a client-server architecture for file sharing, providing location independence, scalability and transparent migration capabilities for data. Feature release.

Open Babel is a chemical toolbox designed to speak the many languages of chemical data. It's an open, collaborative project allowing anyone to search, convert, analyze, or store data from molecular modeling, chemistry, solid-state materials, biochemistry, or related areas.

OpenDS Directory Server, a free and comprehensive next generation (LDAP) directory service (Java)

OpenERP is a complete ERP (Enterprise Resource Planning) and CRM (Customer Relationship Management) software. Client componet.

OpenERP is a complete ERP (Enterprise Resource Planning) and CRM (Customer Relationship Management) software. Server component.

OpenERP is a complete ERP (Enterprise Resource Planning) and CRM (Customer Relationship Management) software. Internet client component.

OpenJade - the DSSSL user community's open source implementation of DSSSL, Document Style Semantics and Specification Language, an ISO standard for rendering SGML and XML documents (based on James Clark's Jade).

OpenJade - the DSSSL user community's open source implementation of DSSSL, Document Style Semantics and Specification Language, an ISO standard for rendering SGML and XML documents (based on James Clark's Jade).

The OpenJPEG library is an open-source JPEG 2000 codec written in C language.

OpenLDAP is a suite of the Lightweight Directory Access Protocol (v3) servers, clients, utilities, and development tools. Stable Release.

OpenLDAP is a suite of the Lightweight Directory Access Protocol (v3) servers, clients, utilities, and development tools. Latest release.

OpenMotif is the publicly licensed version of Motif, the industry standard graphical user interface toolkit for UNIX systems. Manual (PDF).

OpenMotif is the publicly licensed version of Motif, the industry standard graphical user interface toolkit for UNIX systems (stable version).

OpenMotif is the publicly licensed version of Motif, the industry standard graphical user interface toolkit for UNIX systems (bug fix release).

Open MPI - A High Performance Message Passing Library. Open MPI is a project combining technologies and resources from several other projects (FT-MPI, LA-MPI, LAM/MPI, and PACX-MPI) in order to build the best MPI library available.

Open MPI - A High Performance Message Passing Library. Open MPI is a project combining technologies and resources from several other projects (FT-MPI, LA-MPI, LAM/MPI, and PACX-MPI) in order to build the best MPI library available (release candidate).

OpenNMS is an effort to build a fully distributed network management platform providing both enterprise and element management capabilities, using Java 2, XML/XSL and other open source projects/tools such as JBossMQ, RRDTool, Tomcat and PostgreSQL (source code; development version)

OpenNTPD is a free, easy to use implementation of the Network Time Protocol (NTP) - port of OpenBSD's OpenNTPD

OpenNTPD is a free, easy to use implementation of the Network Time Protocol (NTP) - OpenBSD OpenNTPD

OpenProj is an open source project management solution intended as a complete desktop replacement to commercial software like for e.g. Microsoft Project (Java sources).

OpenProj is an open source project management solution intended as a complete desktop replacement to commercial software like for e.g. Microsoft Project (Java binaries).

A variant of James Clark's SP SGML parser, maintained by the OpenJade team ("An SGML System Conforming to International Standard ISO 8879 -- Standard Generalized Markup Language")

The Unix port of OpenBSD's OpenSSH (Secure Shell)

OpenSSH Portable Release (Secure Shell)

OpenSSL - Open Source toolkit implementing the Transport Layer Security (TLS v1) and Secure Sockets Layer (SSL v2/v3) protocols with full-strength cryptography world-wide (successor of SSLeay)

OpenSSL - Open Source toolkit implementing the Transport Layer Security (TLS v1) and Secure Sockets Layer (SSL v2/v3) protocols with full-strength cryptography world-wide (successor of SSLeay)

OpenVAS (Open Vulnerability Assessment System) is a network security scanner (a fork of Nessus)

OpenVPN - a secure IP tunneling (Virtual Private Network) daemon. OpenVPN supports SSL/TLS security, ethernet bridging, TCP or UDP tunnel transport through proxies or NAT, support for dynamic IP addresses and DHCP.

Erlang/OTP is a development environment for building distributed real-time high availability systems. Erlang is a general-purpose programming language and runtime environment. OTP (Open Telecom Platform) is a large collection of libraries for Erlang to do everything from compiling ASN.1 to providing a WWW server. Documentation (HTML)

Erlang/OTP is a development environment for building distributed real-time high availability systems. Erlang is a general-purpose programming language and runtime environment. OTP (Open Telecom Platform) is a large collection of libraries for Erlang to do everything from compiling ASN.1 to providing a WWW server. Source code.

OTRS (Open Ticket Request System) is a ticket request and email management system to manage customer telephone calls and e-mails.

OTRS (Open Ticket Request System) is a ticket request and email management system to manage customer telephone calls and e-mails.

Pango is a library for laying out and rendering of text, with an emphasis on internationalization (an offshoot of the GTK+ and GNOME projects).

A flexible filter for reformatting paragraphs of text

ParaView is a scientific data analysis and visualization application for large data sets.

ParaView - is a scientific data analysis and visualization application for large data sets. Some data.

PARI/GP is a computer algebra system designed for fast computations in number theory (factorizations, algebraic number theory, elliptic curves...), but also contains a large number of other mathematical functions.

GNU patch takes a patch file (generated by the diff program) and produces according patched versions of the affected files.

PCB is an interactive printed circuit board editor for the X11 window system. PCB can produce industry standard RS-274X and Excellon NC-Drill format output for submission to board manufacturers.

PCRE - Perl-compatible regular expressions

PDCurses is a multiple platforms curses library implementing most of the functions available in X/Open and System V R4 curses.

PDFlib - Portable C library for dynamically generating PDF files (the lite version represents a subset of the full ePDFlib product).

PDL - The Perl Data Language project aims to turn perl into an efficient numerical language for scientific computing

Perl (Practical Extraction and Report Language) is a high-level, general-purpose, interpreted, dynamic programming language. Previous stable release.

Perl (Practical Extraction and Report Language) is a high-level, general-purpose, interpreted, dynamic programming language. Current stable release.

Perl (Practical Extraction and Report Language) is a high-level, general-purpose, interpreted, dynamic programming language. Release candidate.

Perl (Practical Extraction and Report Language) is a high-level, general-purpose, interpreted, dynamic programming language. Development release.

A Perl script indenter and beautifier

Petidomo is a small and efficient mailing list manager

PETSc: The Portable, Extensible Toolkit for Scientific Computation - a suite of data structures and routines for the scalable (parallel) solution of scientific applications modeled by partial differential equations (employs the MPI standard)

The PGPLOT Graphics Subroutine Library is a Fortran- or C-callable, device-independent graphics package for making publication quality scientific graphs.

Pidgin is a chat program (multi-protocol instant messaging client) which lets you log in to accounts on multiple chat networks simultaneously (old name "gaim").

Pike is an interpreted, high-level, cross-platform, dynamic programming language (syntax similar to Java and C)

PIKT (Problem Informant/Killer Tool) is a cross-categorical, multi-purpose software for monitoring and configuring computer systems, administering networks, and organizing system security.

pilot-link is a suite of tools used to connect your Palm handheld with Unix, Linux, and any other POSIX-compatible machines.

plan is a calendar and day planner (requires X/Motif)

GNU plotutils produce 2D plots in a variety of formats, built around an enhanced libplot C/C++ function library.

PLplot is a cross-platform software package for creating scientific plots. There are many langaugae bindings to the PLplot library (C, C++, Fortran, Java, Octave, Python, and many more).

Convert a portable anymap into a Portable Network Graphics file (and vice versa)

Poppler is a PDF rendering library (based on the xpdf-3.0 code base)

portmap is a DARPA port to RPC program number mapper.

Postfix is a mail system (an alternative to sendmail)

Postfix is a mail system (an alternative to sendmail). Release candidate.

PostgreSQL Object-Relational Data Base Management System (DBMS), supporting almost all SQL constructs, including subselects, transactions, and user-defined types and functions. Old stable release.

PostgreSQL Object-Relational Data Base Management System (DBMS), supporting almost all SQL constructs, including subselects, transactions, and user-defined types and functions.

PostgreSQL Object-Relational Data Base Management System (DBMS), supporting almost all SQL constructs, including subselects, transactions, and user-defined types and functions. New release.

PostgreSQL Object-Relational Data Base Management System (DBMS), supporting almost all SQL constructs, including subselects, transactions, and user-defined types and functions. Release candidate.

Persistence of Vision(tm) Ray-Tracer - ray trace renderer to create three-dimensional, photo-realistic images (source code, documentation and scene files)

PPR is a print spooler expressly designed for PostScript printers.

A problem reporting and tracking system (requires GTK 2.2.x and PostgreSQL v7.3.x)

The PRepS Tools package contains the server side scripts used to create and update PRepS (a problem reporting system) databases and the libpreps library.

PostScript conversion to plain ASCII or HTML (requires Ghostscript and Python =< 1.5)

Powerful mail processing - can sort incoming mail into separate folders/files, preprocess mail, start any programs upon mail arrival or selectively forward certain incoming mail automatically to someone, can create mailing lists (stable version).

Powerful mail processing - can sort incoming mail into separate folders/files, preprocess mail, start any programs upon mail arrival or selectively forward certain incoming mail automatically to someone, can create mailing lists (development version).

ProFTPD - highly configurable FTP server software (with FTPS support)

ProFTPD - highly configurable FTP server software (with FTPS and SFTP support)

PSPP is a program for statistical analysis of sampled data.

pstoedit translates PostScript and PDF graphics into other vector formats.

Extract ASCII text from a PostScript or PDF file

Shows the ps listing as a tree

GNU Portable Threads - a very portable POSIX/ANSI-C based library for Unix platforms which provides non-preemptive priority-based scheduling for multiple threads of execution (aka "multithreading") inside event-driven applications

Pure-FTPd is a "fast", "standard-conformant" FTP server.

PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms, along with an xterm terminal emulator.

PVM (Parallel Virtual Machine), a software system that enables a collection of heterogeneous computers to be used as a coherent and flexible concurrent computational resource.

Python is an interpreted, interactive, object-oriented programming language (2.x documentation, HTML) Python is an interpreted, interactive, object-oriented programming language (3.x documentation, HTML)

Python is an interpreted, interactive, object-oriented programming language (2.x documentation, PDF A4) Python is an interpreted, interactive, object-oriented programming language (3.x documentation, PDF A4)

Python is an interpreted, interactive, object-oriented programming language. It incorporates modules, exceptions, dynamic typing, very high level dynamic data types, and classes.

Python is an interpreted, interactive, object-oriented programming language (3.x documentation, HTML)

Python is an interpreted, interactive, object-oriented programming language (3.x documentation, PDF A4)

Python is an interpreted, interactive, object-oriented programming language. It incorporates modules, exceptions, dynamic typing, very high level dynamic data types, and classes. Caution: 3.x is incompatible with 2.x.

Q is an extensible functional programming language based on the term rewriting calculus. Q may be useful for scientific programming, and also as a sophisticated kind of desktop calculator.

A quick database manager (an alternative for DBM or its compatibles, NDBM and GDBM)

QGIS (Quantum GIS) is a Geographic Information System that supports vector, raster, and database formats.

Qpopper is a POP3 server (enhanced Berkeley Post Office Protocol Server including TLS/SSL)

Qpopper is a POP3 server (enhanced Berkeley Post Office Protocol Server including TLS/SSL). Beta version.

Qt - a multi-platform GUI software toolkit. It simplifies the task of writing and maintaining GUI (graphical user interface) applications. Qt is written in C++ and is fully object-oriented (free edition).

QtiPlot is a program for two- and three-dimensional graphical presentation of data sets and for scientific data analysis (commercial support available).

Qt - a multi-platform GUI software toolkit. It simplifies the task of writing and maintaining GUI (graphical user interface) applications. Qt is written in C++ and is fully object-oriented (free edition, for X11 only).

Qt is a comprehensive C++ application development framework. It includes a class library and tools for cross-platform development and internationalization. It simplifies the task of writing and maintaining GUI applications (open source edition, for Linux/X11).

R (also known as `GNU S') is a system for statistical computation and graphics.

GNU Radius - a suite of programs for performing remote user authentication and accounting services (using RADIUS protocol).

RapidMiner (formerly YALE) is a knowledge discovery and data mining system. It is available as a stand-alone application for data analysis and as a data mining engine which can be integrated into own products. Source code of the GPL licensed stable version.

RapidMiner (formerly YALE) is a knowledge discovery and data mining system. Manual (German, PDF).

GNU Readline library - get a line from a user with editing

Re-alpine is a fork of Alpine (the "pine" successor) - basically a screen-oriented message-handling tool.

Converts files between character sets and usages (recognises or produces nearly 150 different character sets)

Regina is a Rexx interpreter (an easy to use but powerful programming language).

remind a sophisticated calendar/reminder and alarm program.

Rexx/SQL- A Rexx interface to SQL databases (for documentation see rxsqldoc...)

"MATLAB-like" matrix math programming language

The ROOT system - an OO framework for large scale scientific data analysis and data mining (development version)

RPM is a powerful and mature command-line driven package management system capable of installing, uninstalling, verifying, querying, and updating Unix software packages ("no longer Linux-centric").

RPM is a powerful and mature command-line driven package management system capable of installing, uninstalling, verifying, querying, and updating Unix software packages ("no longer Linux-centric").

RPM is a powerful and mature command-line driven package management system capable of installing, uninstalling, verifying, querying, and updating Unix software packages ("no longer Linux-centric").

RRDtool is a high performance data logging and graphing system for time series data. ("mrtg" successor)

rsync is a fast incremental file-copying tool for bringing remote (and local) files into sync.

Rsyslog is an enhanced multi-threaded syslogd with a focus on security and reliability. Among others it offers support for TCP, SSL, TLS, RELP and writing to databases.

Rsyslog is an enhanced multi-threaded syslogd with a focus on security and reliability. Among others it offers support for TCP, SSL, TLS, RELP and writing to databases. Beta version V5-series.

Rsyslog is an enhanced multi-threaded syslogd with a focus on security and reliability. Among others it offers support for TCP, SSL, TLS, RELP and writing to databases. Development version V6-series.

RT (Request Tracker) is a trouble ticketing system.

Ruby is an interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). Stable 1.8 version.

Ruby is an interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). Stable 1.9 version.

Ruby is an interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). Stable 1.9 version.

RXVT (ouR eXtended Virtual Terminal) is an 8-bit clean, colour less memory using xterm replacement

rxvt-unicode is a clone of the terminal emulator rxvt

Sage is a software application which covers many aspects of mathematics, including algebra, combinatorics, numerical mathematics, and calculus. It combines the power of many existing open-source packages into a common Python-based interface. Caution: Roughly 250 MB!

Samba is an re-implementation of the Microsoft SMB/CIFS protocols for Linux/Unix systems. It provides file and print services to SMB/CIFS clients and enables interoperability between Linux/Unix servers and Windows clients.

Samba is an re-implementation of the Microsoft CIFS/SMB protocols for UNIX systems (now with "experimental" SMB2-support).

Samba is an re-implementation of the Microsoft CIFS/SMB protocols for UNIX systems (preview test-release)

Samba is an re-implementation of the Microsoft CIFS/SMB protocols for UNIX systems (alpha version; with Active Directory support).

SARA (Security Auditor's Research Assistant) - a network security analysis tool. Last release.

Scala is a general purpose programming language designed to express common programming patterns in a concise, elegant, and type-safe way. It smoothly integrates features of object-oriented and functional languages, enabling Java and other programmers to be more productive.

Detects and logs TCP port scans

Scilab is a matrix-based scientific software package resembling Matlab and Xmath. Scilab contains hundreds of built-in mathematical functions, sophisticated data structures (including polynomials, rationals, linear systems, lists, etc...), a high-level interpretor and a macro language, and excellent graphics.

Scilab is a matrix-based scientific software package resembling Matlab and Xmath. English help file in javaHelp format.

Scilab is a matrix-based scientific software package resembling Matlab and Xmath. English help file in PDF format.

SciTE is a source code editing component (used fpr e.g. by SciTE)

SciTE is a SCIntilla based Text Editor. Scintilla itself is a source code editing component supporting syntax styling, error indicators, code completion and call tips (source code; Linux binary is named "gscite").

GNU screen manager with VT100/ANSI terminal emulation (multiplexing up to 10 pseudo-terminals)

GNU sed - stream editor

Sendmail is a general purpose email routing facility that supports many kinds of mail-transfer and mail-delivery methods

A tool to search a file for structured pattern

GNU shar utilities (shar, uuencode, remsync) prepare data for sending via e-mail.

shtool is a compilation of small but very stable and portable shell scripts into a single shell tool.

A computer algebra system, especially for number theoretic purpose.

sK1 is an illustration program that supports professional publishing features, such as CMYK color, separations, ICC color management and press-ready PDF output (a fork of Sketch 0.6.15).

A vector drawing program (old name: sketch; requires python) - stable version

A vector drawing program (requires python) - development version

PostScript standard fonts for sketch-0.7.x (a vector drawing program)

S-Lang is a multi-platform programmer's library supporting display/screen management, keyboard input, keymaps, and so on.

Security Enhanced version of the GNU Locate (index and quickly search for files on your system)

Security Enhanced version of the GNU Locate (index and quickly search for files on your system)

An NNTP based news reader (using S-Lang library)

SmokePing is a network latency logging and graphing system (using MRTG)

SNIPS (Systems & Network Integrated Polling Software) is a rewrite of the NOCOL network monitoring package (now with RRDtool integration)

A graphical user interface (GUI) builder that helps you construct cross platform applications written in Tcl (version 1.2.2a).

The Edinburgh Speech Tools Library (used by the Festival Speech Synthesis System)

The Edinburgh Speech Tools Library (used by the Festival Speech Synthesis System)

A tool for statically checking C programs for security vulnerabilities and coding mistakes (successor to LCLint).

Spring Framework is an application framework for the Java platform and .NET Framework (community edition)

SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. Source code.

SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. The amalgamation (all preprocessed C code combined into a single source file).

SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. Documentation.

SRP -Secure Remote Password protocol (a new mechanism for performing password-based authentication and key exchange over potentially insecure networks)

star - a fast tar archiver with many improvements to other tar implementations (including gnu tar)

strace is a diagnositic, instructional and debugging tool that traces and decodes system calls on Linux, SunOS 4, SysVr4, SunOS 4, Solaris2, and Irix5 platforms.

Stunnel - Universal SSL tunnel (works as SSL encryption wrapper) between remote client and local (inetd-startable) or remote server.

Stunnel - Universal SSL tunnel - works as SSL encryption wrapper between remote client and local (inetd-startable) or remote server. (beta version)

Subversion is a version control system (CVS replacement)

Sudo (su "do") allows a system administrator to delegate authority to give certain users the ability to run some commands as root or another user.

x3270 is an IBM 3270 terminal emulator for the X Window System and Windows. running over a TELNET connection, emulating either an IBM 3279 (color) or 3278 (monochrome).

A sophisticated clock for the X Window system. It displays a map of the Earth and shows which portion is illuminated by the sun.

Earth map images for the sunclock program

Earth map images for the sunclock program

Earth map images for the sunclock program

A setuid-root program that offers restricted setuid-root access to executables, adjustable on a per-program and per-user basis (like sudo) and a relatively secure environment for scripts

Swatch (Simple WATCHdog) activly monitors log files produced by UNIX's syslog facility.

Sylpheed is an X11 e-mail client (and news reader) based on GTK+.

Sympa is an electronic mailing list manager

syslog-ng (syslog "next generation") is a high performance, stable central logging system. Open source edition.

System and network monitor (HTTP, IMAP, SMTP, IMAP, POP3, PING, TCP, UDP, and NNTP based checks)

GNU Tar archiving utility

TAU (Tuning and Analysis Utilities) is a portable profiling and tracing toolkit for performance analysis of parallel programs written in Fortran, C++, C, Java and Python.

TAU (Tuning and Analysis Utilities) is a portable profiling and tracing toolkit for performance analysis of parallel programs written in Fortran, C++, C, Java and Python. User's guide (PDF).

Tcl v8.4 (HTML documentation)

Tcl v8.4 (tool command language. Previous stable release.

Tcl v8.5 (HTML documentation).

Tcl v8.5 (tool command language). Latest stable release.

Tcl v8.6 (HTML documentation). Development version.

Tcl v8.6 (tool command language). Development version.

A package for Tcl 8.x that allows you to load and interact with the Java VM

Extended Tcl (TclX) is a set of extensions to Tcl 8.x (the Tool Command Language) and Tk 8.x

tcpdump is a tool for network monitoring and data acquisition

Tcsh is a version of the Berkeley C-Shell, with the addition of: A command line editor, command and file name completion, listing, ...

The GNU termcap library -- a library of C functions that enable programs to send control strings to terminals in a way independent of the terminal type.

Terracotta - Clustering technology for Java ("Network Attached Memory", "Distributed Cache"; source code)

Terracotta - Clustering technology for Java ("Network Attached Memory", "Distributed Cache"; binary distribution)

GNU's hypertext documentation language (development version)

Xlib base 2-D drawing facility under X11 (also a hyper-graphics browser on the WWW)

A full-screen character mode text editor based on the VM/CMS editor XEDIT (documentation in PDF format, DIN A4)

A full-screen character mode text editor based on the VM/CMS editor XEDIT

A full-screen character mode text editor based on the VM/CMS editor XEDIT

Converts a Tagged Image File Format (TIFF) file into a Portable Network Graphics (PNG) file

LibTIFF - TIFF (tag image format) library and tools

LibTIFF - TIFF (tag image format) library and tools

Scripts that scan a Unix system looking for security problems

TightVNC - an enhanced version of VNC (Virtual Network Computing), allowing remote network access to graphical desktops (stable version)

TIN is a threaded NNTP and spool based UseNet newsreader

TIN is a threaded NNTP and spool based UseNet newsreade ("unstable" version)

Tix, the Tk Interface eXtension, is a powerful set of user interface components that expands the capabilities of your Tcl/Tk and Python applications.

Tk is a Perl interface to Tk8.x (a Graphical User Interface ToolKit)

Tk v8.4 (X11 toolkit implemented with the Tcl scripting language). Previous stable release.

Tk v8.5 (X11 toolkit implemented with the Tcl scripting language). Latest stable release.

Tk v8.6 (X11 toolkit implemented with the Tcl scripting language). Development version.

TkDiff is a graphical "diff" utility (compares two files).

A graphical Tcl/Tk-based browser for documentation in the info hypertext format

A table/matrix widget extension to Tcl/Tk

Reports system statei including a list of the top cpu using processes

Reports system statei including a list of the top cpu using processes

Trac is an enhanced wiki and issue tracking system for software development projects. It provides an interfaces to Subversion (or other version control systems).

Set of tools for creating TeX documents with graphics which are portable (lets xfig export to other formats ie PostScript) Tools for creating portable TeX figures

TRE is a POSIX compliant regexp matching library that supports for e.g. approximate (fuzzy) matching (includes a version of the "agrep" tool).

TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted volume (data storage device).

Truerint prints C (but also C++, Java, Perl, shell, ...) program listings on postscript printers.

txt2pdf is a converter from text files to PDF format files (requires perl5; shareware)

A simple program to extract, test and view RAR archives created with the ARJ archiver

Converts strings from and to 2-byte Unicode UCS2 format (Perl module, needs Startup-x.xxx.tar.gz)

Unison is a file-synchronization tool for Unix and Windows Unison is a file-synchronization tool for Unix and Windows (manual, PDF)

Unison is a file-synchronization tool for Unix and Windows

Unison is a file-synchronization tool for Unix and Windows. Beta version. Unison is a file-synchronization tool for Unix and Windows. Beta version (manual, PDF).

Unison is a file-synchronization tool for Unix and Windows. Beta version.

GNU Units converts quantities expressed in various scales to their equivalents in other scales.

Oberon is a programming language in the Pascal-Modula tradition and a modern operating system for single-user personal workstations. few themes)

Info-ZIP group's portable UnZip zipfile-extraction program (compatible with PKZIP archives)

A source level C and C++ debugger (X11), Fortran is also supported on some systems.

A smart decoder for attachments received in encoded form via electronic mail or from the usenet

V.E.R.A Virtual Entity of Relevant Acronyms (free GNU version)

V.E.R.A Virtual Entity of Relevant Acronyms (shareware?)

ViewVC is a browser interface for CVS and Subversion version control repositories.

VILE is a text editor which optionally retains the "finger-feel" of "vi" while adding the multiple buffer and multiple window features of emacs and other editors.

Vi IMproved (vi clone) - documentation in HTML

Vim - Vi IMproved (vi clone) advanced text editor (with optional GUI)

VisIt is an interactive parallel visualization and graphical analysis tool for viewing scientific data.

VLC (VideoLAN Client) is a multimedia player for various audio and video formats (MPEG-1/2/4, DivX, MP3, Vorbis, Ogg, ...) as well as DVDs, VCDs, and various streaming protocols.

VM (aka View Mail) is a mail reader that runs inside GNU Emacs and XEmacs (supports POP and IMAP).

RealVNC (Virtual Network Computing) Free Edition for Unix/Linux - cross-platform remote control between Windows and Unix/Linux computers (full source code to both Viwer and Server)

iRealVNC (Virtual Network Computing) Free Edition for Linux (x86) - cross-platform remote control between Windows and Unix/Linux (installable packages including Viewer, XFree86 module, stand-alone Server and x0vncserver).

RealVNC (Virtual Network Computing) Java Viewer Source Distribution

vsftpd is a "secure, fast and scalable" FTP server

Visual Tcl - application development environment for UNIX, Windows and Macintosh platforms (Tcl/Tk).

Visual Tcl - application development environment for UNIX, Windows and Macintosh platforms (Tcl/Tk).

The Visualization ToolKit (VTK) is an software system for 3D computer graphics, image processing, and visualization. It consists of a C++ class library, and several interpreted interface layers including Tcl/Tk, Java, and Python.

The Visualization ToolKit (VTK) Data (examples and tests)

The Visualization ToolKit (VTK) Documentation (man pages; HTML)

Show full path of commands

Wine is an Open Source implementation of the MS Windows API on top of X, OpenGL, and Unix. Think of Wine as a compatibility layer for running Windows programs.

Wine is an Open Source implementation of the MS Windows API on top of X, OpenGL, and Unix. Think of Wine as a compatibility layer for running Windows programs. Development release.

The Wine Developers Guide (HTML format)

The Wine Developers Guide (PDF format)

Wine's documentation repository. It consists of various guides and their translations.

The Winelib User Guide (HTML format)

The Winelib User Guide (PDF format)

The Wine User Guide (HTML format)

The Wine User Guide (PDF format)

Wireshark is a network traffic/protocol analyzer (old name was "ethereal")

Text and comments reformatter

Multiformat animation viewer for X

XaoS is a fast portable real-time interactive fractal zoomer.

Automatic screen locking after period of inactivity

Release 1.5E of the Xaw3d toolkit. It is based on X.Org's X11R6.3 Athena toolkit, with bits and pieces thrown in from other sources. It is intended to be a general-purpose replacement for the Athena (Xaw) toolkit.

Matrix Motif widget set (allows a semi-spreadsheet view of data)

XBMC is a software media player and entertainment hub for digital media that plays almost all popular audio and video formats around.

X Cut Buffers

A program-package dedicated to easy CD creation. It combines command line tools like "cdrecord", "cdda2wav", and "mkisofs" into a graphical user interface.

XChat is an IRC chat program (for both Linux and Windows).

XCircuit is a X11 program for drawing publishable-quality electrical circuit schematic diagrams and related figures. It can also be used as a generic drawing program.

XCircuit is a X11 program for drawing publishable-quality electrical circuit schematic diagrams and related figures. It can also be used as a generic drawing program. Development release.

A multiwindow mouse-based text editor (X11) with a built-in browser for C functions and C++ classes, methods, files etc...

A snapshot performance monitor

New delta generator and prototype RCS-replacement program

A tool and library for differential compression (supports VCDIFF encoding and decoding).

Converts any terminal based program into a program with an X-windows interface (help button+box, treeview, editbox, file selector, range box, and much more; uses Gtk)

Preview .dvi files (TeX)

XEmacs (an alternative to GNU Emacs) is a highly customizable open source text editor and application development system (current version).

XEmacs (an alternative to GNU Emacs) is a highly customizable open source text editor and application development system (beta version).

The Xemacs Sumo Tarball - a big collection of XEmacs lisp packages for Mule (MULtilingual Enhancement to GNU Emacs).

The Xemacs Sumo Tarball - a big collection of XEmacs lisp packages (roughly 35 MB!)

The Xen hypervisor is a virtual machine monitor for x86, x86_64, IA64, PowerPC and other CPU architectures that supports execution of multiple guest operating systems in isolated environments

Compiles statistics about wuftpd (FTP daemon) transfers

Xfig is an interactive drawing tool (X11)

XForms is a graphical user interface toolkit for X based on the X11 Xlib library.

XForms graphical user interface toolkit for X Window Systems (documentation, HTML).

X11 file system monitoring

A powerful replacement for inetd

Graphically display and edit the X11 keyboard mapping

X11 Image Loading Utililty (image viewer)

xlockmore is an X11 display locker/screensaver

Xlogmaster is a tool to monitor logfiles & hardware status (uses GTK+).

xmail is an internet and intranet mail server featuring an ESMTP server, POP3 server, finger server, TLS support for SMTP and POP3 (both server and client side), SMTP authentication and many other features

Motif-based BDF (Bitmap Distribution Format) font editor

Digital image warping (morphing) for X11

Image warping and dissolving (morphing) programs

GNU Xnee is a suite of programs that can record, replay and distribute user actions under the X11 environment.

An eXtensible Open Router Platform for IPv4 and IPv6. The supported protocols are currently BGP, RIP, OSPF, PIM-SM, and IGMP/MLD.

XPaint is a bitmap/pixmap editing tool

Security patch for the PDF viewer release xpdf-3.02.tar.gz (see also pl2, pl3, pl4 patches)

Security patch for the PDF viewer release xpdf-3.02.tar.gz (see also pl1 and pl3, pl4 patches)

Security patch for the PDF viewer release xpdf-3.02.tar.gz (see also pl1, pl2 and pl4)

Security patch for the PDF viewer release xpdf-3.02.tar.gz (Note: the patches are separate; you'll need to apply the pl1, pl2, pl3, and pl4 patches, in that order)

PDF viewer (see security patch xpdf-3.02pl1.patch

Xplanet displays rendered image of the earth or another planet (user supplied maps; requires the imlib library)

Yet Another X11/Motif-based File Manager (requires Xg widget set)

Fast tool to graph and visualize lots of data (for e.g. from TCP Packet Trace Analysis)

Process tree display and manipulation (X11)

XRN a X News reader (using NNTP)

XScreenSaver is a large collection of screen savers and also the framework for blanking and locking the screen.

xtem_TeXMenu provides for a simple and comfortable graphical user interface (GUI) to control many TeX/LaTeX facilities

xterm is a terminal emulator for X with ISO/ANSI color and vt220 enhancements.

A X-window programming environment

Yacas - Yet Another Computer Algebra System

Emulates SGI's GL routines under X11

Yodl - Extensible document language

Multi-user replacement for UNIX talk

ZABBIX is an enterprise-class distributed monitoring solution for servers and applications (previous stable version)

ZABBIX is an enterprise-class distributed monitoring solution for servers and applications

Encryption/decryption support for Zip 2.3 and UnZip 5.41 (and later)

A compression and file packaging utility. It is compatible with PKZIP 2.04g (Phil Katz ZIP) for MSDOS systems. A compression and file packaging utility. It is compatible with PKZIP 2.04g (Phil Katz ZIP) for MSDOS systems.

zlib is a general purpose data compression library

ZMailer - SMTP Mail Transfer Agent (MTA) (intended for gateways or mail servers that have extreme demands on the abilities of the mailer)

Zsh is a powerful UNIX command interpreter (shell). Reference card (a little bit out-dated).

Zsh is a powerful UNIX command interpreter (shell). Documentation.

Zsh is a powerful UNIX command interpreter (shell).

Zsh is a powerful UNIX command interpreter (shell). FAQ,

Zsh is a powerful UNIX command interpreter (shell). User's guide (PDF, A4 format, 335 pages).