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Free software programmed in C
(Topics List)1964 (emulator) - 1964 is a Nintendo 64 emulator for Microsoft Windows, written in C and released as free software.
AAlib - AAlib is a software library which allows applications to automatically convert still and moving images into ASCII art.
Amaya (web browser) - Amaya is a free and open source WYSIWYG web authoring tool with browsing abilities, created by a structured editor project at the INRIA, a French national research institution, and later adopted...
Ambient (desktop environment) - Ambient is a MUI based desktop environment for MorphOS. Its development was started in 2001 by David Gerber.
Apache HTTP Server - The Apache HTTP Server, commonly referred to as Apache, is web server software notable for playing a key role in the initial growth of the World Wide Web.
Apcupsd - Apcupsd is an application that runs on Linux, UNIX and some Windows machines.
Arachne (web browser) - Arachne is a full-screen Internet suite containing a graphical web browser, email client, and dialer.
Asterisk (PBX) - Asterisk is a software implementation of a telephone private branch exchange originally created in 1999 by Mark Spencer of Digium.
Audacious Media Player - Audacious is a GUI-based free software media player for POSIX systems, such as Linux.
authbind - authbind is an Open source system utility written by Ian Jackson and is distributed under the GNU General Public License.
Avahi (software) - Avahi is a free Zeroconf implementation, including a system for multicast DNS/DNS-SD service discovery.
Avidemux - Avidemux is an open-source program designed for multi-purpose video editing and processing.
Ayam (software) - Ayam is a free 3D modelling environment for the RenderMan interface.
Bash (Unix shell) - Bash is a free software Unix shell written for the GNU Project.
Beep Media Player - The Beep Media Player was a free audio player, based on the XMMS multimedia player.
Berkeley Yacc - Berkeley Yacc is a reimplementation of the Unix parser generator Yacc, originally written by Robert Corbett in 1990.
BibDesk - BibDesk is an open-source reference management software package for Mac OS X, used to manage bibliographies and references when writing essays and articles.
BitPim - BitPim is an open source program designed specifically for managing content on CDMA devices.
Blender (software) - Blender is a 3D graphics application released as free software under the GNU General Public License.
BRP-PACU - BRP-PACU is a dual channel FFT audio analysis tool.
Burn (software) - Burn is a free optical disc authoring application for the Mac OS X operating system.
Cairo (graphics) - Cairo is a software library used to provide a vector graphics-based, device-independent API for software developers.
Caudium - Caudium is an open source web server.
CDex - CDex is a CD ripper for Microsoft Windows.
Cdrskin - Cdrskin is a CD-R, DVD-R, DVD+R, CD-RW, DVD-RW, DVD-RAM, and DVD+RW burning command-line interface tool as a part of the Libburnia project.
Chemtool - Chemtool is free software program for drawing chemical structural formulas, written in C using GTK for Unix and Linux.
Clam AntiVirus - Clam AntiVirus is a free, cross-platform antivirus software tool-kit capable of detecting many types of malicious software, including viruses.
Compiz - Compiz is one of the first compositing window managers for the X Window System that uses 3D graphics hardware to create fast compositing desktop effects for window management.
Compiz Fusion - Compiz Fusion is a collection of plugins and a configuration system for the Compiz compositing window manager for the X Window System.
Concurrent Versions System - The Concurrent Versions System, also known as the Concurrent Versioning System, is a free software revision control system in the field of software development.
CPython - CPython is the default, most-widely used implementation of the Python programming language.
CuneiForm (software) - In computer software, CuneiForm is an OCR tool.
DAP (software) - Dap is a statistics and graphics program, that performs data management, analysis, and graphical visualization tasks which are commonly required in statistical consulting practice.
dcraw - dcraw is an open source computer program which is able to read numerous raw image formats, typically produced by high-end digital cameras.
Dia (software) - Dia is free and open source general-purpose diagramming software, developed as part of the GNOME project's office suite and was originally created by Alexander Larsson.
Dillo - Dillo is a minimalistic web browser particularly intended for older or slower computers and embedded systems.
Distributed Access Control System (DACS) - The Distributed Access Control System is a light-weight single sign-on and role-based access control system for web servers and server-based software.
DOSBox - DOSBox is an emulator which emulates an IBM PC compatible computer running MS-DOS. It is intended especially for use with old PC games.
Dynamic Computer Algebra System - Dcas is a dynamic computer algebra system featuring the idea of using identities as rules for manipulation of algebra.
E equational theorem prover - E is a modern, high performance theorem prover for full first-order logic with equality.
e2fsprogs - e2fsprogs is a set of utilities for maintaining the ext2, ext3 and ext4 file systems.
EAS3 - EAS3 is a software toolkit for reading and writing structured binary data with geometry information and for postprocessing of these data.
EasyTag - EasyTag is a graphical tag editor for GNU/Linux and Windows, distributed under the GNU General Public License.
Emacs - Emacs is a class of feature-rich text editors, usually characterized by their extensibility.
Emacspeak - Emacspeak is a free screen reader for Emacs which is written in C, Emacs Lisp and Tcl and developed principally by T. V. Raman and first released May 1995; it is portable to all POSIX-compatible...
Embedded GLIBC - EGLIBC, or Embedded GLIBC, is a variant of the GNU C Library, optimised for use in embedded devices, while still attempting to remain source and binary compatible with the standard glibc.
Empathy (software) - Empathy is an instant messaging client which supports text, voice, video, file transfers, and inter-application communication over various IM protocols.
Enterprise Volume Management System - Enterprise Volume Management System is a flexible, integrated volume management software used to manage storage systems under Linux.
Evince - Evince is a document viewer for PDF, PostScript, DjVu, TIFF and DVI designed for the GNOME desktop environment.
f2c - f2c is the name of a program to convert Fortran 77 to C code, developed at Bell Laboratories.
Fast Library for Number Theory - The Fast Library for Number Theory is a highly optimized C library for number theory applications.
fbpanel - fbpanel is a lightweight NetWM compliant desktop panel written in C using the GTK+ library.
ffdshow - ffdshow is a media decoder and encoder mainly used for the fast and high-quality decoding of video in the MPEG-4 ASP and AVC formats, but supporting numerous other video and audio formats as well.
FFmpeg - FFmpeg is a free software / open source project that produces libraries and programs for handling multimedia data and publishes them under the GNU Lesser General Public License or GNU General Pu...
File System Visualizer - File System Visualizer, also known as fsv, is a 3D file browser using OpenGL, created by Daniel Richard G. It is a clone of SGI's fsn file manager for IRIX systems, aimed to run on modern Linux ...
Filesystem in Userspace - Filesystem in Userspace is a loadable kernel module for Unix-like computer operating systems, that allows non-privileged users to create their own file systems without editing the kernel code.
Firefly Media Server - Firefly Media Server is an open-source media server for the Roku SoundBridge and iTunes.
Flashrom - Flashrom is a universal flash programming utility used to detect, read, erase, or write BIOS chips.
FreeMat - FreeMat is a free open source numerical computing environment and programming language, similar to MATLAB and GNU Octave.
FreeWRT - FreeWRT is a Linux distribution for embedded systems like wireless routers by Linksys and Asus.
friendly interactive shell - The friendly interactive shell is a Unix shell which focuses on interactive use, discoverability, and user friendliness.
Fuse (emulator) - The Free Unix Spectrum Emulator is an emulator of the 1980s ZX Spectrum home computer and its various clones for Unix, Windows and Mac OS X. Fuse is free software, released under the GNU General...
Ganglia (software) - Ganglia is a scalable distributed system monitor tool for high-performance computing systems such as clusters and grids.
GD Graphics Library - The GD Graphics Library is a graphics software library by Thomas Boutell and others for dynamically manipulating images.
Geany - Geany is a lightweight cross-platform GTK+ text editor based on Scintilla and including basic Integrated Development Environment features.
Genius (mathematics software) - Genius is a free open source numerical computing environment and programming language, similar in some aspects to MATLAB, GNU Octave, Mathematica and Maple.
gentoo (file manager) - gentoo is a free file manager for Linux and other Unix-like computer systems created by Emil Brink; it is licensed under the GNU General Public License.
giFT - giFT Internet File Transfer is a computer software daemon that allows several file sharing protocols to be used with a simple client having a graphical user interface.
Git (software) - Git is a free distributed revision control, or software source code management project with an emphasis on being fast.
GLib - In computing, GLib refers to a cross-platform software utility library.
Glypha III - Glypha III is a Joust clone for the Macintosh written in C by John Calhoun.
Gnome Wave Cleaner - Gnome Wave Cleaner is a digital audio editor application.
GnomeBaker - GnomeBaker is a free CD/DVD authoring application for Unix-like computer operating systems.
GNU arch - In computing, GNU arch is a distributed revision control system that is part of the GNU Project and licensed under the GNU General Public License.
GNU C Library - The GNU C Library, commonly known as glibc, is the C standard library released by the GNU Project.
GNU Core Utilities - The GNU Core Utilities or coreutils is a package of GNU software containing many of the basic tools, such as cat, ls, and rm, needed for Unix-like operating systems.
GNU Multi-Precision Library - The GNU Multiple-Precision Library, also known as GMP, is a free library for arbitrary-precision arithmetic, operating on signed integers, rational numbers, and floating point numbers.
GNU PDF - GNUpdf is a GNU project that aims to completely implement the Portable Document Format standards in free software.
GNU readline - GNU readline is a software library created and maintained by the GNU Project.
GNU Scientific Library - In computing, the GNU Scientific Library is a software library written in the C programming language for numerical calculations in applied mathematics and science.
GnuCash - GnuCash is a free and open source accounting software program that implements a double-entry bookkeeping system.
Gnumeric - Gnumeric is a spreadsheet program that is part of the GNOME desktop and has Windows installers available.
gnuplot - gnuplot is a command-line program that can generate two- and three-dimensional plots of functions, data, and data fits.
GnuWin32 - The GnuWin32 project provides native ports in the form of runnable computer programs, patches, and source code for various GNU and open source tools and software, much of it modified to run on t...
GPM (software) - GPM which means "general purpose mouse" provides mouse support in Linux virtual consoles.
GPSBabel - GPSBabel is a cross-platform, Free Software to transfer routes, tracks, and waypoint data to and from consumer GPS units, and to convert between over 100 types of GPS data formats.
GPUTILS - GPUTILS is a GPL-licensed set of tools for the PIC microcontroller, comprising an assembler, disassembler, linker, and object file viewer.
GQview - GQview is a free software image viewer created by John Ellis using the GTK+ toolkit, designed to run on the X Window System.
GrafX2 - GrafX2 is a bitmap graphics editor inspired by the Amiga programs Deluxe Paint and Brilliance.
GRASS GIS - GRASS GIS is a free, open source geographical information system capable of handling raster, topological vector, image processing, and graphic data.
GROMACS - GROMACS is a molecular dynamics simulation package originally developed in the University of Groningen, now maintained and extended at different places, including the University of Uppsala, Univ...
GStreamer - GStreamer is a pipeline-based multimedia framework written in the C programming language with the type system based on GObject.
gThumb - gThumb is an open-source image viewer and organizer for the GNOME desktop environment released under the GNU General Public License.
gtk-gnutella - gtk-gnutella is a peer-to-peer file sharing application for Unix-like computer operating systems, which runs on the Gnutella network.
gtkpod - gtkpod is a free, open source software project hosted at SourceForge.net and published under the GNU General Public License.
GTKWave - GTKWave is a fully featured GTK+ based waveform viewer which reads FST, LXT, LXT2, VZT, and GHW files as well as standard Verilog VCD/EVCD files and allows their viewing.
Gtranslator - gtranslator is an enhanced gettext po file editor for the GNOME desktop environment.
HandBrake - HandBrake is an open-source program designed to convert MPEG video into an MPEG-4 video file in MPEG-4 Part 14 or Matroska containers.
HMMER - HMMER is a free and commonly used software package for protein sequence analysis written by Sean Eddy.
HomeBank - HomeBank is a personal accounting software package that runs on Linux, FreeBSD, Microsoft Windows and AmigaOS.
HTML Tidy - HTML Tidy is a computer program and a library the purpose of which is to fix invalid HTML and to improve the layout and indent style of the resulting markup.
IBM OpenDX - OpenDX stands for Open Data Explorer and is IBM's scientific data visualization software.
ImageMagick - ImageMagick is an open source software suite for displaying, converting, and editing raster image files.
Intelligent Input Bus - The Intelligent Input Bus is an input method framework for multilingual input in Unix-like operating systems.
ipchains - Linux IP Firewalling Chains, normally called ipchains, is free software to control the packet filter/firewall capabilities in the 2.2 series of Linux kernels.
Irssi - Irssi is an IRC client program originally written by Timo Sirainen, and released under the terms of the GNU General Public License in Jan 1999.
Joe's Own Editor - JOE or Joe's Own Editor is a terminal-based text editor for Unix systems, available under the GPL. It is designed to be easy to use.
Jupp (editor) - jupp is a portable version of Joe's Own Editor version 3.1 forked by Thorsten Glaser in 2004 when the development of JOE stagnated.
JWM - JWM is a lightweight stacking window manager for the X Window System written by Joe Wingbermuehle.
Kernel-based Virtual Machine - Kernel-based Virtual Machine is a Linux kernel virtualization infrastructure.
Korn shell - The Korn shell is a Unix shell which was developed by David Korn in the early 1980s.
LabPlot - LabPlot is an open source data analysis and visualisation program, written for KDE. It is similar to Origin and is able to import Origin's data files.
LADSPA - LADSPA is an acronym for Linux Audio Developers Simple Plugin API.
LaTeX2RTF - LaTeX2RTF is a translator program which is intended to convert a LaTeX document into the RTF format which can be imported by several text processors.
libpng - libpng is the official Portable Network Graphics reference library.
libsndfile - libsndfile is a widely-used C library written by Erik de Castro Lopo for reading and writing audio files.
Liferea - Liferea is an abbreviation for Linux Feed Reader, a news aggregator for online news feeds.
lighttpd - lighttpd is an open-source web server more optimized for speed-critical environments than common products while remaining standards-compliant, secure and flexible.
LINA (software) - LINA is a piece of open-source software that enables users to run applications compiled for Linux under Windows and Mac OS X with a native look and feel.
Lincity - Lincity is a free construction and management simulation game, which puts the player in control of managing every aspect of a city's socio-economy.
Linux framebuffer - The Linux framebuffer is a graphic hardware-independent abstraction layer to show graphics on a console without relying on system-specific libraries such as SVGALib or the heavy overhead of the ...
Linux kernel - The Linux kernel is an operating system kernel used by the Linux family of Unix-like operating systems.
Lis (linear algebra library) - Lis is a scalable parallel library for solving linear equations and eigenvalue problems using sparse iterative methods.
LiVES - LiVES is a free software video editing program and VJ tool, released under the GNU General Public License.
Lm sensors - lm_sensors, a free open source software-tool for Linux, provides tools and drivers for monitoring temperatures, voltage, and fans.
log4c - Log4C is a C-based logging library.
LTTng - LTTng is a tracer for Linux being actively developed.
Lua (programming language) - In computing, Lua is a lightweight, reflective, imperative and functional programming language, designed as a scripting language with extensible semantics as a primary goal.
MakeIndex - MakeIndex is a computer program which provides a sorted index from unsorted raw data.
Mathomatic - Mathomatic is a free, portable, general-purpose computer algebra system that can symbolically solve, simplify, combine, and compare algebraic equations, perform complex number and polynomial ari...
md5deep - md5deep is a software package used in the computer security, system administration and computer forensics communities for purposes of running large numbers of files through any of several differ...
mdadm - mdadm is a Linux utility by Neil Brown that is used to manage software RAID devices, previously known as mdctl.
mediaLib - mediaLib is a portable low level library for accelerating multimedia applications, with interfaces in C. It is developed by Sun Microsystems and open sourced under the CDDL license as part of ...
MegaZeux - MegaZeux, or MZX, is a game creation system inspired by Tim Sweeney/Epic Megagames' classic shareware game ZZT. MegaZeux was created in late 1994 by Gregory Janson, who formed his own comp...
MEncoder - MEncoder is a free command line video decoding, encoding and filtering tool released under the GNU General Public License.
Mercurial - Mercurial's major design goals include high performance and scalability, decentralized, fully distributed collaborative development, robust handling of both plain text and binary files, and adva...
Mesa 3D (OpenGL) - Mesa 3D is an open source 3D computer graphics library that provides a generic OpenGL implementation for rendering three-dimensional graphics on multiple platforms.
MiKTeX - MiKTeX is a typesetting system for Microsoft Windows and Linux operating systems that is developed by Christian Schenk.
mined (text editor) - Mined is a terminal-based text editor providing extensive Unicode and CJK support, available under the GPL.
MinGW - MinGW, formerly mingw32, is a native software port of the GNU Compiler Collection to Microsoft Windows, along with a set of freely distributable import libraries and header files for the W...
Minicom - Minicom is a text-based modem control and terminal emulation program for Unix-like operating systems, originally written by Miquel van Smoorenburg, and modeled after the popular MS-DOS program Telix.
Miredo - Miredo is an open-source Teredo IPv6 tunneling software for Linux and BSD operating systems as well as recent versions of Mac OS X.
MLDonkey - MLDonkey is an open source, multi-protocol, peer-to-peer file sharing application that runs as back-end server application on many platforms.
Mobile Web Server (Symbian OS) - The Mobile Web Server software is an Open source software port by Nokia of the Apache HTTP Server to the Symbian OS S60 mobile software platform.
mod openpgp - mod_openpgp is an Apache server module authored by Arturo 'Buanzo' Busleiman that implements access authorization to servers, vhosts, or directories when incoming requests' HTTP OpenPGP signatur...
Mongoose (server) - Mongoose is a standalone or embedded web server written in C, which is designed to be very small, multi-threaded, and portable; it is the successor to shttpd.
Monkey (web server) - Monkey HTTP Daemon is a very fast and lightweight Web server just for Linux written in the C programming language,and is licensed as free software under the GNU General Public License.
Moonlight (runtime) - Moonlight is a free and open source implementation of the Silverlight web application framework.
MP3Gain - MP3Gain is free software cross-platform audio normalizer software: it analyzes the MP3 and losslessly modifies files so that they have the same perceived volume.
Mp3splt - Mp3splt is a free digital audio splitter that runs on Linux, Mac OS X, and Microsoft Windows operating systems.
Music on Console - Music On Console is an ncurses-based console audio player for Linux/UNIX written by Damian Pietras.
nano (text editor) - In computing, nano is a curses-based text editor for Unix and Unix-like systems.
NaviServer - NaviServer is a high performance web server written in C and Tcl.
Ne (text editor) - ne is a console text editor for POSIX computer operating systems such as Linux or Mac OS X. It uses the terminfo library, but it can also be compiled using a bundled copy of the GNU termcap impl...
NEdit - NEdit, the Nirvana editor, is a popular text editor and source code editor for the X Window System.
Netpbm - Netpbm is an open source package of graphics programs and a programming library, used mainly in the Unix world.
Network Audio System - The Network Audio System is an open-source, network-transparent, client-server audio transport system.
Notepad2 - Notepad2 is an open-source text editor for Microsoft Windows, released under a BSD software license.
nouveau (graphics) - nouveau is an X.Org Foundation and Freedesktop.org project which was initially based on the obfuscated 2D-only free and open source "nv" driver, aiming to develop free software drivers for Nvidi...
ntfsprogs - Ntfsprogs is a collection of free Unix utilities for managing the NTFS filesystem used by Windows XP, Windows Server 2003, Windows 2000, Windows NT 4.0, Windows Vista, Windows Server 2008 and Wi...
Nullsoft Scriptable Install System - Nullsoft Scriptable Install System is a script-driven Windows installation system with minimal overhead backed by Nullsoft, the creators of Winamp.
Openbox - Openbox is a free window manager for the X Window System, licensed under the GNU General Public License.
OpenLDAP - OpenLDAP Software is a free, open source implementation of the Lightweight Directory Access Protocol developed by the OpenLDAP Project.
OptiPNG - OptiPNG is an open source command line computer program that reduces the size of PNG files.
ORX - Orx is an open source, portable, lightweight, plugin-based, data-driven and easy to use 2D-oriented game engine written in C.
Palimpsest Disk Utility - Palimpsest Disk Utility does S.M.A.R.T. monitoring.
Panorama Tools - Panorama Tools are a suite of programs and libraries originally written by the German physics and mathematics professor Helmut Dersch.
PARI/GP - PARI/GP is a computer algebra system with the main aim of facilitating number theory computations.
pcap - In the field of computer network administration, pcap consists of an application programming interface for capturing network traffic.
Pidgin (software) - Pidgin is a multi-platform instant messaging client, based on a library named libpurple.
Pigment (software) - Pigment is a 3D scene graph library designed to easily create rich application user interfaces.
pngcrush - pngcrush is a free, open source command-line utility that reduces the size of PNG files losslessly—that is, the resulting "crushed" image will have the same quality as the source image.
PortAudio - PortAudio is a computer library for audio playback and recording.
Potrace - Potrace is an open source, cross-platform computer program which converts bitmapped images into vector graphics.
Praat - Praat is a free scientific software program for the analysis of speech in phonetics.
premake - In software development, premake is a open source utility for automatically building configuration from source code.
Privoxy - Privoxy is a web proxy program, frequently used in combination with Tor and Squid.
PulseAudio - PulseAudio is a cross-platform, networked sound server commonly used on Linux operating systems.
PuTTY - PuTTY is a terminal emulator application which can act as a client for the SSH, Telnet, rlogin, and raw TCP computing protocols.
qmail - qmail is a mail transfer agent that runs on Unix.
QuickSynergy - QuickSynergy is a graphical interface for Mac OS and Linux for easily configuring Synergy.
RasMol - RasMol is a computer program written for molecular graphics visualization intended and used primarily for the depiction and exploration of biological macromolecule structures, such as those foun...
ReactOS - ReactOS is an open source computer operating system intended to be binary compatible with application software and device drivers made for Microsoft Windows NT versions 5.x and up.
RecordMyDesktop - RecordMyDesktop is a desktop screencasting software application written for GNU/Linux.
Rlab - Rlab is an interactive, interpreted numerical computation program and its core programming language, written by Ian Searle.
RRDtool - RRDtool aims to handle time-series data like network bandwidth, temperatures, CPU load etc.
Ruby MRI - Matz's Ruby Interpreter or Ruby MRI is the reference implementation of the Ruby programming language.
SciGraphica - SciGraphica is an open source data analysis and visualisation program, similar to the proprietary, Microcal Origin.
Shoes (GUI toolkit) - Shoes is a simplified experimental GUI toolkit based on the Ruby Programming Language, developed by why the lucky stiff and others.
sK1 (program) - sK1 is an open-source illustration program for the Linux platform that can be used as a substitute for professional proprietary software like CorelDRAW or Adobe Illustrator.
Skencil - Skencil, formerly called Sketch, is a free software vector graphics editor, released under the GNU Lesser General Public License.
SmallBASIC - SmallBASIC is a BASIC programming language dialect with interpreters released as free software under the GNU General Public License version 2.
SnapPea - SnapPea is free software designed to help mathematicians, in particular low-dimensional topologists, study hyperbolic 3-manifolds.
SoftGenLock - SoftGenLock is a piece of software that provides Genlock and quad buffer page flipped stereo between a cluster of PCs. The SoftGenLock Open Source project originated from the Laboratoire d'Infor...
SoX - Sound eXchange, abbreviated SoX, is a free cross-platform digital audio editor, licensed under the GNU General Public License, and distributed by Chris Bagwell through SourceForge.net.
Stratagus - Stratagus was a free cross-platform real time strategy game engine used to build other games that is written in C. Lua is used as the configuration language.
Streamripper - Streamripper is a stand-alone client or Winamp plugin that records Internet radio streams in the MP3 or Vorbis formats.
Subversion (software) - In software development, Subversion is a version-control system initiated in 1999 by CollabNet Inc. Developers use Subversion to maintain current and historical versions of files such as source ...
Sylpheed - Sylpheed is an open source e-mail and news client licensed under the GPL. It provides easy configuration and an abundance of features.
Tesseract (software) - In computer software, Tesseract is a free optical character recognition engine.
The Hessling Editor - The Hessling Editor is one of the older open source text editor projects.
thttpd - thttpd is an open source software web server from ACME Laboratories, designed for simplicity, a small execution footprint and speed.
TightVNC - TightVNC is a cross-platform open source remote desktop software application that uses and extends VNC's RFB protocol to control another computer's screen remotely.
TiMidity++ - TiMidity++, originally and still frequently informally called TiMidity, is a software synthesizer that can play MIDI files without a hardware synthesizer.
TinTin++ - TinTin++ is a MUD client primarily written for Linux like systems.
Tor (anonymity network) - The Onion Router is a free software implementation of second-generation onion routing enabling Internet anonymity by thwarting network traffic analysis.
Totem (media player) - Totem is a media player for the GNOME computer desktop environment which runs on GNU, Linux, Solaris, BSD and other Unix and Unix-like systems.
Transmission (BitTorrent client) - Transmission is a BitTorrent client which features a simple interface on top of a cross-platform back-end.
Tux Paint - Tux Paint is a free and open source bitmap graphics editor geared towards young children.
tvtime - tvtime is a program for Linux that allows a person to watch television through his or her PC using a TV tuner or a satellite receiver card DVB-S.
UFO: Alien Invasion - UFO: Alien Invasion is an open source strategy video game in which the player fights aliens that are trying to take control of the Earth.
UFRaw - UFRaw is an application which can read and manipulate photographs in raw image formats, as created by many digital cameras.
Unladen Swallow - Unladen Swallow is an optimization branch of CPython, intended to be fully compatible and significantly faster.
Usplash - Usplash is a software project in the Ubuntu community that replaces the scrolling-text screens that appear while booting a Linux-based computer with a graphical splash screen.
Utah GLX - Utah GLX was a project aimed at creating a fully open source basic hardware-accelerated 3D rendering for XFree86 and OpenGL before the introduction of the Direct Rendering Infrastructure in XFre...
Uzbl - Uzbl is a free and open source minimalistic web browser designed for simplicity and adherence to the Unix philosophy.
V9fs - Plan 9 from User Space is a port of many Plan 9 from Bell Labs libraries and applications to Unix-like operating systems.
VirtualDubMod - VirtualDubMod is an open source video capture and linear processing tool for Microsoft Windows.
Website Meta Language - Website META Language is a free and extensible web designer's off-line HTML generation toolkit for Unix, distributed under the GNU General Public License.
Wine (software) - Wine is a free software application that aims to allow Unix-like computer operating systems to execute programs written for Microsoft Windows.
X Neural Switcher - X Neural Switcher, or xneur, is a free software computer program for automatic keyboard layout changing in the X Window System, and runs on all flavours of Linux and BSD. Currently, it is ...
x2vnc - x2vnc allows the console on an X terminal to be used to control another console running a VNC server.
x2x - x2x allows the console on one X terminal to be used to control another X terminal.
Xarchiver - Xarchiver is a front-end to various command line archiving tools for Linux and BSD operating systems, designed to be independent of the desktop environment.
XEmacs - XEmacs is a graphical- and console-based text editor which runs on almost any Unix-like operating system as well as Microsoft Windows.
xine - xine is a multimedia playback engine for Unix-like operating systems released under the GNU General Public License.
XMD - XMD is a classical molecular dynamics software designed to simulate problems related to materials science.
XMMS - The X Multimedia System is a free software audio player very similar to Winamp, that runs on many Unix-like operating systems.
xrdp - xrdp is an open source remote desktop protocol server based on the work of rdesktop.
XVidCap - XVidCap is a free software used for recording a screencast or digital recording of an X Window System screen output with an audio narration.
XZ Utils - XZ Utils is a set of free lossless data compressors, including LZMA and xz, for Unix-like operating systems controlled by a command-line interface.
xzgv - xzgv is a simple, small software utility that can be used for viewing digital images or pictures of several formats, e.g., jpeg, gif, PNG, etc.
Yafc - Yafc is a command-line FTP program, its name an acronym for 'Yet Another FTP Client'.
YXORP - YXORP'YXORP is a Reverse proxy for the HTTP protocol, written by Sytse van Slooten.
zgv - zgv is an image viewer for SVGAlib or SDL that incorporates a thumbnail-based file selector.
ZSNES - ZSNES is a free SNES emulator written mostly in x86 assembly with official ports for Linux, MS-DOS, and Windows.
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