The original vi editor

http://ex-vi.sourceforge.net/

IBM 3270 font for the nostalgic

https://github.com/rbanffy/3270font

The traditional 4.4BSD /bin/csh C-shell

Resolution tool for Intel i915 video cards

Port of various original plan9 tools

http://tools.suckless.org/9base

Find the country that any IP address or hostname originates from

http://dev.maxmind.com/geoip/legacy

Fast image processing tools based on ImageMagick

http://www.graphicsmagick.org/

Haskell code font with monospaced ligatures

https://github.com/i-tu/Hasklig

Fast pixel formats conversion library

Image processing tools

http://www.ImageMagick.org/

Image processing tools

http://www.ImageMagick.org/

Image processing tools (unstable version)

http://www.ImageMagick.org/

Enhanced Printer Spooler

http://lprng.sourceforge.net/

High-performance CORBA ORB with support for the C language

Language for statistical computing and graphics

http://www.R-project.org/

Unicode Character Database

http://unicode.org/ucd/

3-D Athena Widget set that looks like Motif

TrueType font server for X11

http://www.hadrons.org/software/xfstt/

Formats an ASCII file for printing on a postscript printer

http://www.inf.enst.fr/~demaille/a2ps/

An ascii art library

http://aa-project.sourceforge.net/aalib/

Open-source, cross-platform WYSIWYG word processor

http://www.abisource.com/

Addressbook program with mutt mail client support

http://abook.sourceforge.net/

Interactive Python accessibility explorer for GNOME

https://wiki.gnome.org/Apps/Accerciser

D-Bus interface for user account query and manipulation

http://cgit.freedesktop.org/accountsservice/

Receive faxes using sound card and radio

Analog Clock for GNUstep

http://gap.nongnu.org/aclock/index.html

Messaging and Integration Patterns provider

http://activemq.apache.org

Program for sending email messages for CVS repository commits

http://search.cpan.org/dist/activitymail/

ADAMEm is a portable Coleco ADAM and ColecoVision emulator

http://www.komkon.org/~dekogel/adamem.html

Versatile addressbook for GNUstep

http://gap.nongnu.org/addresses/index.html

Goodies for addressbook for GNUstep

http://giesler.biz/bjoern/en/sw_addr.html

Adobe CMap collection

http://partners.adobe.com/asn/tech/type/ftechnotes.jsp

Database library for PHP

http://adodb.sourceforge.net

SDL MAME port with advanced TV and monitor video support

http://www.advancemame.it/

GNOME Symbolic Icons

Affiche allows people to stick notes

http://www.collaboration-world.com/cgi-bin/project/index.cgi?pid=5

Window manager originally based on the Bowman NeXTstep clone

http://www.afterstep.org/

FTP-like shell for accessing Apple II disk images

High Quality Rendering Engine for C++

http://www.antigrain.com/

Approximate grep (fast approximate pattern-matching tool)

Replacement and extension for Tripwire

https://aide.github.io/

802.11 WEP and WPA-PSK keys cracking program

http://www.aircrack-ng.org/

Collection of patience games written in guile scheme

https://wiki.gnome.org/Apps/Aisleriot

Morse code training program

http://www.nongnu.org/aldo/

Free multi-lingual font designed for screens

http://alef.hagilda.com/

Serif typeface originally intended for literature

https://github.com/huertatipografica/Alegreya-libre

Humanist sans serif font with a calligraphic feeling

http://www.huertatipografica.com/fonts/alegreya-sans-ht

Wrapper around the freetype2 library

http://opensnc.sourceforge.net/alfont/

Interpreter for purely symbolic LISP

http://www.t3x.org/alisp/

Cross-platform library for games and multimedia programming

https://liballeg.org/