Library to help with AppStream metadata

https://github.com/hughsie/appstream-glib/

GNUstep application wrapper

http://appwrapper.sourceforge.net/

Apache Portability Library

https://apr.apache.org/

Create & extract files from DOS .ARC files

https://github.com/ani6al/arc

Asynchronous DNS resolver library

ftp://athena-dist.mit.edu/pub/ATHENA/ares/

ICC compatible color management system

http://www.argyllcms.com/

Yet another download tool

https://aria2.github.io/

Open source implementation of the ARJ archiver

http://arj.sourceforge.net/

Text document format for writing short documents and man pages

https://github.com/asciidoc-py/asciidoc-py

Afterstep clock with some language extensions

Cross-platform C++ library for network and low-level I/O programming

http://think-async.com/Asio/

Spelling checker with better suggestion logic than ispell

http://aspell.net/

Ispell compatibility script for aspell

http://aspell.net/

Library to import various 3D model formats in a uniform manner

https://github.com/assimp/assimp

Assisted Technology Provider module for GTK+

https://gitlab.gnome.org/GNOME/at-spi2-atk

Assistive Technology Service Provider Interface

https://gitlab.gnome.org/GNOME/at-spi2-core

C, C++ and shell libraries to write ATF-compliant test programs

https://github.com/jmmv/atf/

GNOME accessibility toolkit (ATK)

https://developer.gnome.org/atk/

C++ wrapper for ATK API library

https://www.gtkmm.org/

Yet another little mind game

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

Software for collecting and analyzing calls from different PBX models

http://www.atslog.com/en/about/

Generate configure scripts and related files

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

Set of useful GNU Autoconf macros

https://savannah.gnu.org/projects/autoconf-archive

Wrapper script for GNU autoconf

Automatically configure source code on many Un*x platforms (2.13)

http://sources.redhat.com/autoconf/

Tool designed to simplify the creation and maintenance of programs

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

GNU Standards-compliant Makefile generator

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

Automatically restart SSH sessions and tunnels

https://www.harding.motd.ca/autossh/

Autotools meta-port

Tool to automatically update DNSSEC trust anchors

http://www.nlnetlabs.nl/projects/autotrust/

Service discovery on a local network

http://www.avahi.org/

IPv4LL network address configuration daemon

http://www.avahi.org/

Gtk+ 3 library to the Avahi mDNS system

http://www.avahi.org/

Install an avahi-gtk* header to avoid conflict

http://www.avahi.org/

mDNSResponder compatibility from Avahi

http://www.avahi.org/

Free real-time logfile analyzer to get advanced web statistics

https://www.awstats.org/

Command Line Interface for Backblaze's B2 storage service

https://www.backblaze.com/b2/docs/quick_command_line.html

Dynamic pixel format conversion library

https://www.gegl.org/babl/

Network backup solution (static client)

http://www.bacula.org/

Bacula document set

http://www.bacula.org/

GNOME 3 graphical directory tree analyzer

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

GNU Project's Bourne Again SHell

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

Programmable completion library for Bash

https://github.com/scop/bash-completion

GNUstep battery monitor for laptops

http://www.nongnu.org/gap/batmon/index.html

Monsters, explosions, destruction game for X Window System

https://www.evl.uic.edu/aej/AndyBattalion.html

Daemon monitoring the battery level of ACPI-enabled laptops

https://github.com/ntarmos/battmond/

Bruce's C compiler (with as and ld); can do 16-bit code

Convert X font from BDF to PCF

https://www.x.org/archive/X11R6.8.1/doc/bdftopcf.1.html

Collect logs locally and send to remote logstash

https://www.elastic.co/products/beats/

Sample screen saver for X