Command line version of 2048

https://github.com/Tiehuis/2048-cli

2048 game implemented in QT

https://github.com/xiaoyong/2048-Qt

The original vi editor

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

IBM 3270 font for the nostalgic

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

X Window 3D Pong game for 1 or 2 players

http://www.newbreedsoftware.com/3dpong/

The traditional 4.4BSD /bin/csh C-shell

The traditional 4.4BSD rdist

Console version of the 7-Zip file archiver

https://www.7-zip.org/

Resolution tool for Intel i915 video cards

Port of various original plan9 tools

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

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 (legacy version)

https://legacy.imagemagick.org/

Image processing tools

https://imagemagick.org/

C++/Python lib of 2D/3D vector, matrix, math ops for computer graphics

https://github.com/AcademySoftwareFoundation/Imath/

Enhanced Printer Spooler

http://lprng.sourceforge.net/

Language for statistical computing and graphics

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

Unicode Character Database

https://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

https://www.gnu.org/software/a2ps/

ASCII art library

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

GNU Compiler Collection for bare metal aarch64 cross-development

https://gcc.gnu.org/

Open-source, cross-platform WYSIWYG word processor

https://www.abisource.com/

AbiWord help files

http://www.abisource.com/

Addressbook program with mutt mail client support

http://abook.sourceforge.net/

Abseil Common Libraries (C++)

https://abseil.io/

Interactive Python accessibility explorer for GNOME

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

D-Bus interface for user account query and manipulation

https://gitlab.freedesktop.org/accountsservice/accountsservice

Receive faxes using sound card and radio

FUSE file system driver for Arcan window managers

https://arcan-fe.com/

Analog Clock for GNUstep

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

PC/SC driver for CS CCID smart card readers

https://www.acs.com.hk/en/driver/4/acr38-smart-card-reader/

Messaging and Integration Patterns provider

https://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

Complain about inappropriate commercial use (f.e. SPAM) of usenet/e-mail

http://www.rdrop.com/users/billmc/adcomplain.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

Easy to use asynchronous-capable DNS client library and utilities

http://www.chiark.greenend.org.uk/~ian/adns/

Adobe CMap collection

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

Database library for PHP

http://adodb.org/

Automatic differentiation library

https://github.com/coin-or/ADOL-C

GNOME Symbolic Icons

Adobe Font Development Kit for OpenType (AFDKO)

https://github.com/adobe-type-tools/afdko

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

File system automounting implemented in user-space using FUSE

https://github.com/pcarrier/afuse