Automated unit testing framework for C

http://cunit.sourceforge.net/

Common UNIX Printing System

https://github.com/OpenPrinting/cups

CUPS backend for Canon USB over IP protocol

http://cups-bjnp.sourceforge.net/

Print using Google Cloud Print

http://www.niftiestsoftware.com/cups-cloud-print/

Additional backends, filters and other software for CUPS

https://wiki.linuxfoundation.org/openprinting/cups-filters

Fuji Xerox Printer Driver

http://www.fujixerox.co.jp/download/apeosport/download/c4300series/linux_module.html

Virtual printer for CUPS to produce PDF files

http://www.cups-pdf.de/

Helper that makes system-config-printer use PolicyKit

http://www.freedesktop.org/software/cups-pk-helper

CUPS backend for printing to Windows servers

http://www.cups.org/articles.php?L294

Non-interactive tool to get files from FTP, GOPHER, HTTP(S) servers

https://curl.se/ https://github.com/curl/curl

Cuse4BSD character device loopback driver for userspace

http://www.selasky.org/hans_petter/cuse4bsd/

Version control system

cvs-server only shell

CVS to Subversion Repository Converter

http://cvs2svn.tigris.org/

Tutorial and reference for CVS

http://cvsbook.red-bean.com/

Utility to generate changelogs and reports from a CVS repository

http://cvschangelogb.sourceforge.net/

Create patchset information from CVS

http://cvsps.sourceforge.net/

CVS patchsets

http://www.cobite.com/cvsps/

Bitstream Cyberbit TrueType font that covers Unicode 2.0

http://www.bitstream.com/

Cyrillic X11 bitmap fonts from CYR-RFX project

http://www.inp.nsk.su/~bolkhov/files/fonts/cyr-rfx/00index.en.html

RFC 2222 SASL (Simple Authentication and Security Layer)

https://www.cyrusimap.org/sasl/

SASL LDAPDB auxprop plugin

http://cyrusimap.web.cmu.edu/

SASL authentication server for cyrus-sasl2

https://www.cyrusimap.org/sasl/

Compiler for Writing C Extensions for the Python Language

https://cython.org/

Data Acquisition abstraction library for snort 2.9+

https://www.snort.org/

Typeface that melts text and data visualisation

http://figs-lab.com/en/datalegreya

Manipulate db(3)'s btree(3) and hash(3) databases - NetBSD port

http://cvsweb.netbsd.org/bsdweb.cgi/src/usr.bin/db/

Berkeley DB package, revision 4.8

http://www.oracle.com/us/products/database/berkeley-db/db/

Oracle Berkeley DB, revision 5.3

https://www.oracle.com/database/berkeley-db/db.html

Oracle Berkeley DB, revision 6.2

http://www.oracle.com/us/products/database/berkeley-db/db/

A distributed network benchmarking system

http://www.kusa.ac.jp/~yukio-m/dbs/

Message bus system for inter-application communication

http://www.freedesktop.org/Software/dbus

GLib bindings for the D-BUS messaging system

https://www.freedesktop.org/wiki/Software/DBusBindings/

Distributed Checksum Clearinghouse bulk email detector

https://www.rhyolite.com/dcc/

Configuration database system for GNOME

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

Configuration database editor for GNOME

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

Update dynamic DNS entries

https://github.com/ddclient/ddclient

Command-line utility for converting a Debian .deb file to a .tar.gz

Install Debian base system into a directory

https://wiki.debian.org/Debootstrap

Model to synchronize multiple instances over DBus

https://launchpad.net/dee

Automated program/system tester

http://www.gnu.org/software/dejagnu/

Bitstream Vera Fonts clone with a wider range of characters

https://dejavu-fonts.github.io/

Couple of command line utilities for working with desktop entries

https://www.freedesktop.org/wiki/Software/desktop-file-utils/

8086 development tools

http://homepage.ntlworld.com/robert.debath/

AMD and Intel CPUs microcode updates

Developer help browser for GNOME 3

http://www.imendio.com/projects/devhelp/

Tool to effectively maintain todo lists aimed at developers

http://swapoff.org/devtodo.html

Wonderful Sega Genesis/MegaDrive emulator

http://dgen.sourceforge.net/

KAME DHCP6 client, server, and relay

http://wide-dhcpv6.sourceforge.net/

Decode and diagnose sniffed DHCP packets

http://www.mavetju.org/unix/general.php