Cantarell, a Humanist sans-serif font family

https://wiki.gnome.org/Projects/CantarellFonts

Gnome On-Screen keyboard

https://live.gnome.org/Caribou

Managing notes on small cards

Mark Crispin's C-client mail access routines

https://www.washington.edu/imap/

CDDB client bundle GNUstep

http://gsburn.sourceforge.net/

Diff readability enhancher for color terminals

https://github.com/ymattw/cdiff

Compare directories and select files to copy

http://home.hccnet.nl/paul.schuurmans/linux/index.html#xdircmp

CDDA extraction tool (also known as ripper)

https://www.xiph.org/paranoia/

Record CD-R[W]s in disk-at-once mode

http://cdrdao.sourceforge.net/

CD/DVD/BluRay and ISO-9660 image creation and extraction tools

http://cdrecord.org/

The CELT ultra-low delay audio codec

https://www.celt-codec.org/

Vector graphics tool for GNUstep

http://www.cenon.info/dLinux_gb.html

Library for reading and writing files in FITS data format

https://heasarc.gsfc.nasa.gov/docs/software/fitsio/

Unit test framework for C

https://libcheck.github.io/check/

Feelter thet cunferts Ingleesh text tu Muck Cheenese-a

http://mysite.verizon.net/ebrowne72/chef/index.html

A utility to quickly check multiple folders for new email

AcoustID audio fingerprinting library

https://acoustid.org/chromaprint

Tool to chroot softwares easily

https://sourceforge.net/projects/chrootsafe/

Tool to modify DT_RPATH in existing ELF binaries

Synchronise computer clock to CHU radio station

https://www.rossi.com/chu/

Tool to compress ISO images to CSO format

https://github.com/laffer1/ciso-maker

Open-source (GPL) anti-virus engine (Regular Feature Release)

https://www.clamav.net/

Update script for third-party ClamAV databases

https://github.com/extremeshok/clamav-unofficial-sigs

C, Objective-C, and C++ compiler

http://clang.llvm.org/

GNU project to create a free Java class library

http://www.classpath.org/

Emoji annotation files in CLDR

https://github.com/fujiwarat/cldr-emoji-annotation

GTK+ 2.x engine based on Bluecurve

http://clearlooks.sourceforge.net/

Clearlooks Metacity theme

http://clearlooks.sourceforge.net/

Clearlooks themes with the engine coming from gtk-engines2

http://clearlooks.sourceforge.net/

Command line video extraction tool for YouTube and others

http://clive.sourceforge.net

Class Library for Numbers

https://www.ginac.de/CLN/

CLucene is a C++ port of Lucene

https://sourceforge.net/projects/clucene/

Qt bindings for the CLucene full-text search library

http://qt-project.org

OpenGL based interactive canvas library

http://clutter-project.org/

Clutter GStreamer integration

https://clutter-project.org/

Clutter GStreamer integration

https://clutter-project.org/

GTK+ Integration library for Clutter

http://clutter-project.org/

GTK+ Integration library for Clutter

https://blogs.gnome.org/clutter/

Meta-port to connect all CMake bits

https://www.cmake.org/

Set of cmake modules for fedora developers

https://pagure.io/cmake-fedora

Modules and Templates for CMake

http://www.cmake.org/

Framework for developing PHP web applications

https://codeigniter.com/

Clutter OpenGL abstraction library

http://clutter-project.org/

Optimization library with support for COIN-OR CLP, CBC, and CGL

https://projects.coin-or.org/CoinMP

Manage color profiles to accurately color input/output devices

https://www.freedesktop.org/software/colord

Manage color profiles to accurately color input/output devices

https://www.freedesktop.org/software/colord

Convenience package to install the compat4x libraries

A convenience package to install the compat5x libraries

Convenience package to install the FreeBSD 6.x compat libraries

Convenience package to install the FreeBSD compat7x libraries