Methods to convert R data to YAML and back

https://cran.r-project.org/web/packages/yaml/

Multiple, Unpacking, and Destructuring Assignment

https://cran.r-project.org/web/packages/zeallot/

S3 Infrastructure for Regular and Irregular Time Series

https://cran.r-project.org/web/packages/zoo/

Unicode Character Database

https://unicode.org/ucd/

Wnn6 client library

https://www.omronsoft.co.jp/

Wnn7 client library

https://www.omronsoft.co.jp/

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

Expose the Online Accounts API to QML applications

https://gitlab.com/groups/accounts-sso

D-Bus interface for user account query and manipulation

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

Receive faxes using sound card and radio

Kanji code converter

https://hp.vector.co.jp/authors/VA004474/etc/etc.html

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

TrueType monospaced font designed for X environments

https://b.agaric.net/page/agave

High Quality Rendering Engine for C++

http://www.antigrain.com/

Approximate grep (fast approximate pattern-matching tool)

File and directory integrity checker

https://aide.github.io/

AirSpy's usemode driver and associated tools

https://airspy.com/

Collection of patience games written in guile scheme

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

ajaxzip2 (Japanese ZIP code utility) core scripts

https://www.kawa.net/works/ajax/ajaxzip2/ajaxzip2.html

ajaxzip2 (Japanese ZIP code utility) ZIP data

https://www.kawa.net/works/ajax/ajaxzip2/ajaxzip2.html

Storage server for KDE-Pim

https://community.kde.org/KDE_PIM/Akonadi

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