Create & extract files from DOS .ARC files

https://github.com/ani6al/arc

Asynchronous DNS resolver library

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

Standalone version of arguments parsing functions from GLIBC

https://github.com/argp-standalone/argp-standalone/

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/

Set of (improved) artwiz fonts

http://artwizaleczapka.sourceforge.net/

Set of (improved) artwiz fonts

http://artwizaleczapka.sourceforge.net/

Set of (improved) artwiz fonts

http://artwizaleczapka.sourceforge.net/

Set of free fonts for X11 desktops

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

Atari 8-bit computer emulator

http://atari800.sourceforge.net/

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/

Configuration editing tool

http://augeas.net/

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

"meta-port" for the Avahi service discovery suite

http://www.avahi.org/

Service discovery on a local network

http://www.avahi.org/

IPv4LL network address configuration daemon

http://www.avahi.org/

Gtk+ tools and bindings to the Avahi mDNS system

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/

Average font

http://iotic.com/averia/

Highly configurable, next generation framework window manager

https://awesomewm.org/

Universal Command Line Interface for Amazon Web Services

https://aws.amazon.com/cli/

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

Firmware extractor for Broadcom wireless adapters

https://bues.ch/cms/hacking/misc.html#linux_b43_driver_firmware_tools

Highly legible font family for aircraft cockpit screens

https://github.com/polarsys/b612

Dynamic pixel format conversion library

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

Network backup solution (client)

https://www.bacula.org/

Bacula document set

https://www.bacula.org/