Letter: A
- AGReader - Console reader for viewing AmigaGuide files
- AllegroOGG - Ogg library for use with the Allegro game library
- aalib - ASCII art library
- aasaver - A screensaver for KDE which presents an ASCII aquarium
- abcMIDI - ABC to/from MIDI conversion utilities
- abcde - A Better CD Encoder
- abcm2ps - A program to typeset ABC tunes into Postscript
- abe - Scrolling, platform-jumping, ancient pyramid exploring game
- abicheck - ABI checking tool
- abiword - The AbiWord word processor
- abook - Text-based addressbook program for mutt
- abuse - The classic Crack-Dot-Com game
- ack - Grep-like text finder
- acpi - Command-line ACPI client
- acpitool - A command line ACPI client for Linux
- adime - Allegro Dialogs Made Easy
- adminutil - Utility library for directory server administration
- adns - Advanced, easy to use, asynchronous-capable DNS client library
- adplay - An AdLib (OPL2) music player build on AdPlug
- adplug - A software library for AdLib (OPL2) emulation
- advancecomp - Recompression utilities for .PNG, .MNG and .ZIP files
- agave - Generate a variety of colorschemes from a single starting color
- agistudio - AGI integrated development environment
- aiccu - AICCU - SixXS Automatic IPv6 Connectivity Client Utility
- aide - Intrusion detection environment
- aiksaurus - An English-language thesaurus library
- aircrack-ng - 802.11 (wireless) sniffer and WEP/WPA-PSK key cracker
- airsnort - Wireless LAN (WLAN) tool which recovers encryption keys
- akode - Audio-decoding framework
- alex4 - Alex the Allegator 4 - Platform game
- alexandria - Book collection manager
- alfont - Font rendering library for the Allegro game library
- alienblaster - Action-loaded 2D arcade shooter game
- alleggl - OpenGL support library for Allegro
- allegro - A game programming library
- alleyoop - Graphical front-end to the Valgrind memory checker for x86
- alliance - Alliance VLSI CAD Sytem
- alltray - Dock any application in the tray
- alphabet-soup - Guide your worm through the soup to spell words
- alsa-oss - Advanced Linux Sound Architecture (ALSA) wrapper for OSS
- alsa-tools - Specialist tools for ALSA
- alsamixergui - GUI mixer for ALSA sound devices
- altermime - Alter MIME-encoded mailpacks
- amarok - Media player for KDE
- amarokFS - Simple, nice looking full screen front-end for Amarok
- amavisd-new - Email filter with virus scanner and spamassassin support
- amsn - MSN Messenger clone for Linux, Mac and Windows
- animorph - 3D Animation and Morph Library
- anjuta - Integrated Development Environment
- anjuta-gdl - Components and library for GNOME development tools
- ant-contrib - Collection of tasks for Ant
- antiword - MS Word to ASCII/Postscript converter
- ants - Guide your ants safely home before they drop of the cliff
- aoetools - ATA over Ethernet Tools
- apachetop - A top-like display of Apache logs
- apcupsd - APC UPS Power Control Daemon for Linux
- apel - A Portable Emacs Library
- apg - Automated Password Generator for random password generation
- aplus-fsf - Advanced APL interpreter with s interface
- apmud - Power management daemon for Apple PowerPC laptops
- apollon - Filesharing client
- apt - Debian's Advanced Packaging Tool with RPM support
- aqsis - Open source RenderMan-compliant 3D rendering solution
- aquamarine - Themeable window decorator and compositing manager for Beryl
- arc - Arc archiver
- archivemail - A tool for archiving and compressing old email in mailboxes
- archmage - Extensible reader/decompiler of files in CHM format
- ardour - Multichannel Digital Audio Workstation
- argus - Network transaction audit tool
- aria2 - High speed download utility with resuming and segmented downloading
- arj - Archiver for .arj files
- arm-gp2x-linux-SDL - Cross Compiled SDL Library targeted at arm-gp2x-linux
- arm-gp2x-linux-binutils - Cross Compiling GNU binutils targeted at arm-gp2x-linux
- arm-gp2x-linux-gcc - Cross Compiling GNU GCC targeted at arm-gp2x-linux
- arm-gp2x-linux-glibc - Cross Compiled GNU C Library targeted at arm-gp2x-linux
- arm-gp2x-linux-kernel-headers - Kernel headers for Cross Compiling to arm-gp2x-linux
- arm-gp2x-linux-zlib - Cross Compiled zlib Library targeted at arm-gp2x-linux
- armacycles-ad - A lightcycle game in 3D
- arp-scan - Scanning and fingerprinting tool
- arrows - Neat little maze game
- artwiz-aleczapka-fonts - Set of (improved) artwiz fonts
- asa - Convert Fortran carriage control characters
- asc - Advanced Strategic Command
- asc-music - Background music for the game asc
- asciidoc - Text based document generation
- aspell-ar - Arabic dictionary for Aspell
- aspell-he - Hebrew dictionary for Aspell
- aspell-mi - GNU Aspell Maori Dictionary Package
- aspell-sk - Slovak dictionaries for Aspell
- astromenace - Hardcore 3D space shooter with spaceship upgrade possibilities
- astromenace-data - Hardcore 3D space shooter with spaceship upgrade possibilities
- astyle - Source code formatter for C-like programming languages
- asylum - SDL port of the game Asylum, originally for the Archimedes
- asymptote - Descriptive vector graphics language
- atanks - Remake of a classic DOS game "Scorched Earth"
- aterm - Afterstep XVT, VT102 emulator for the X Window system
- athcool - Enables/disables Powersaving mode for AMD processors
- atitvout - ATI Rage/Radeon TV Out configuration program
- atlas - Automatically Tuned Linear Algebra Software
- atlascpp - WorldForge message protocol library
- atomix - Little mind game where you have to build molecules out of atoms lying around
- atomorun - Jump&Run game where you have to flee an exploding nuclear bomb
- audacious - A GTK2 based media player similar to xmms
- audacious-docklet - A docklet plugin for Audacious
- audacious-plugins - Plugins for the Audacious media player
- audacity - A multitrack audio editor
- audio-convert-mod - A simple audio file converter supporting many formats
- audio-entropyd - Generate entropy from audio output
- aumix - Audio mixer based on ncurses
- auriferous - Game inspired by the classic Loderunner
- autobuild-applet - Panel applet for indication of Test-AutoBuild status
- autodir - Creates user directories on demand
- autodownloader - GUI-tool to automate the download of certain files
- autogen - Sourcecode autogenerator
- autossh - Utility to autorestart SSH tunnels
- autotrace - Utility for converting bitmaps to vector graphics
- avarice - Program for interfacing the Atmel JTAG ICE to GDB
- avr-binutils - Cross Compiling GNU binutils targeted at avr
- avr-gcc - Cross Compiling GNU GCC targeted at avr
- avr-gdb - GDB for (remote) debugging avr binaries
- avr-libc - C library for use with GCC on Atmel AVR microcontrollers
- avrdude - Software for programming Atmel AVR Microcontroller
- awstats - Advanced Web Statistics
- azureus - A BitTorrent Client