| ANGRYsearch | A file searcher that provides instant results as you type | https://github.com/dotheevo/angrysearch/ | GPLv2 | false |
| ANK djbdns | Web interface for 'djbdns' | http://www.nattis.com/dns/ | SimplePermissiveNoNonWarranty | false |
| AOLserver | Web server | http://aolserver.sourceforge.net/ | GPL
MPL | false |
| AOP Alliance | library for interoperability for Java AOP implementations | http://aopalliance.sourceforge.net/ | PublicDomain
GPLv2 | false |
| APAz | A PHP anonymizer. | http://apaz.labs.libre-entreprise.org/ | GPLv2orlater | false |
| APCu | APC User Cache for PHP 5 (transitional package) | http://pecl.php.net/package/APCu | Other | false |
| APE Tag Libraries | C, Clojure, Erlang, Lua, Python, Ruby Libraries for reading/writing APEv2 tags. | http://github.com/jeremyevans/ape tag libs | Expat | false |
| API Sanity Checker | automatic generator of basic unit tests for a C/C++ library API. | https://github.com/lvc/api-sanity-checker | GPLv2 | false |
| API accessor for gravatar.com | API accessor for gravatar.com | http://www.horde.org/ | Other | false |
| APK Editor Studio | Powerful yet easy-to-use APK editor | https://qwertycube.com/apk-editor-studio/ | | false |
| APNG Assembler | assemble APNG animation from PNG/TGA image sequence | https://sourceforge.net/projects/apngasm | Other | false |
| APNG Optimizer | optimize APNG animated images | http://apng.sourceforge.net | Other | false |
| APQ | Ada95 Database Library | http://web.archive.org/web/20110609012236/http://framework.kow.com.br/ | Other
GPLv2orlater | false |
| APQ PostgreSQL | PostgreSQL impementation for the APQ database bindings | http://web.archive.org/web/20110609012236/http://framework.kow.com.br/ | Other
GPLv2orlater | false |
| APSR | TCP/IP packet sender to test firewalls and other network applications | http://www.aa-security.de/ | GPLv2 | false |
| APScheduler | In-process task scheduler with Cron-like capabilities | https://pypi.org/project/APScheduler | Other | false |
| APacheDEX | Compute APDEX from Apache-style logs | http://git.erp5.org/gitweb/apachedex.git | GPLv2orlater
Expat | false |
| ARChon Packager | ARChon Packager (formerly Chrome APK Packager) is a convenient way to produce Chrome ARChon Custom Runtime packages directly from your phone. | https://github.com/bpear96/ARChon-Packager | GPLv3orlater | false |
| ARChon Runtime for Chrome | Run Android Apps in Chrome in OS X, GNU/Linux and Windows | https://archon-runtime.github.io/ | | false |
| ARDEN | specificity control for read alignments using an artificial reference | http://sourceforge.net/projects/arden/ | Other | false |
| ARandR | Simple visual front end for XRandR | http://christian.amsuess.com/tools/arandr/ | GPLv3orlater | false |
| ARts | Framework for developing modular multimedia applications | https://web.archive.org/web/20060106015222/http://www.arts-project.org/ | LGPLv2orlater | false |
| ASCEND | A flexible modelling environment for hard engineering and science problems. | http://ascend.cheme.cmu.edu/ | GPLv2 | false |
| ASEPRITE | sprite and pixel art editor | http://www.aseprite.org/ | Zlib
Other
GPLv2orlater
BSD 3Clause | false |
| ASIS | Ada Semantic Interface Specification | http://docs.adacore.com/asis-docs/html/asis ug/asis ug/introduction.html#introduction | GPLv3orlater | false |
| ASN.1 Compiler | ASN.1 compiler for C | http://asn1c.sourceforge.net | GPLv2orlater
BSD 2Clause | false |
| ASPSeek | Search engine | http://www.aspseek.org/ | GPLv2orlater | false |
| AST | Handle World Coordinate Systems in Astronomy (main shared lib) | http://www.starlink.ac.uk/ast | PublicDomain
Other | false |
| AT Emulator | Emulate a communication device, like a modem | https://www.celersms.com/at-emulator.htm | | false |
| AT1 | JACK autotuner | http://kokkinizita.linuxaudio.org/linuxaudio/ | GPLv2orlater | false |
| ATC-pie | Air traffic control simulation (solo and multi-player) | https://sourceforge.net/projects/atc-pie | GPLv3 | false |
| ATK | The Gnome accessibility toolkit | https://developer.gnome.org/atk/ | LGPLv2orlater | false |
| ATLAS | Generates high-performance mathematical libraries | http://math-atlas.sourceforge.net/ | BSD 3Clause | false |
| ATM SAR Library (SARLib) | ATM Segmentation and Reassembly Library. | http://sarlib.sourceforge.net/ | GPLv2orlater | false |
| ATOS | Manage projects, generate invoices, and estimate your taxes | https://github.com/jbelelieu/atos | AGPL-3.0 | false |
| ATSLog | A web-oriented interface for collecting, viewing and analysing calls for various types of PBXs. | https://sourceforge.net/projects/atslog.berlios/ | GPLv2orlater | false |
| AUnit | AUnit, a unit testing framework for Ada: documentation | http://libre.adacore.com/libre/ | GPLv3orlater | false |
| AVFS | Lets programs look at archived files without having to recompile them | http://www.inf.bme.hu/~mszeredi/avfs/avfs.html | GPLv2 | false |
| AVInfo | Displays audio/video header information | http://shounen.ru/soft/avinfo/ | GPLv2orlater | false |
| AVRA | assembler for Atmel AVR microcontrollers | http://avra.sourceforge.net | Other
GPLv2orlater | false |
| AVbin | a thin wrapper around FFmpeg. | https://avbin.github.io/AVbin/Home/Home.html | GPLv2orlater
LGPLv3orlater | false |
| AVideo | A powerful, 100% libre video and audio downloader for GNU/Linux | https://notabug.org/GPast/avideo | GPLv3orlater | false |
| AWF | Web framework for a CMS/portal/online group | http://web.archive.org/web/20120917065920/http://www.awf-cms.org/ | GPLv2orlater | false |
| AWOL | In/out board | http://sourceforge.net/projects/awol/ | GPLv2 | false |
| AWS SDK for PHP | software development kit to build solutions for Amazon | http://aws.amazon.com/sdkforphp/ | Other
Expat | false |
| AWStats | Generates and displays Web server statistics graphically | http://awstats.sourceforge.net/ | GPLv2orlater | false |
| AZR3 | drawbar organ simulator | http://ll-plugins.nongnu.org/azr3/ | GPLv2 | false |
| Aac-tactics | Coq tactics for reasoning modulo AC (theories) | http://sardes.inrialpes.fr/~braibant/aac tactics/ | LGPLv3 | false |
| Aafigure | ASCII art to image converter. | https://launchpad.net/aafigure | BSD 3Clause | false |
| Aalib | ASCII art library | http://aa-project.sourceforge.net/aalib/ | LGPL | false |
