Interactive C program browser

http://cscope.sourceforge.net/

Sound synthesizer

https://csound.com/

Feature-filled tagfile generator for vi and emacs clones

http://ctags.sourceforge.net/

BitTorrent Client written in C for FreeBSD and Linux

http://www.rahul.net/dholmes/ctorrent/

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

Command line tool and library for transferring data with URLs

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

Command line tool and library for transferring data with URLs

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

Mount remote FTP directories

https://curlftpfs.sourceforge.net/

Credential Validation Modules

https://untroubled.org/cvm/

Version control system

IPv6 enabled cvs. You can use IPv6 connection when using pserver

IPv6 enabled cvs. You can use IPv6 connection when using pserver

http://www.cvshome.org/

cvs-server only shell

Tutorial and reference for CVS

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

Utility to generate changelogs and reports from a CVS repository

http://cvschangelogb.sourceforge.net/

Graph the life story of a file under CVS or RCS

https://web.archive.org/web/20181111235708/http://www.akhphd.au.dk/~bertho/cvsgraph/

Create patchset information from CVS

http://cvsps.sourceforge.net/

CVS patchsets

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

WWW CGI script to browse CVS repository trees version 3

http://www.FreeBSD.org/projects/cvsweb.html

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/

Compiler for Writing C Extensions for the Python Language

https://cython.org/ https://github.com/cython/cython

High-level C Binding for ZeroMQ

http://czmq.zeromq.org

Data Acquisition abstraction library for snort 2.9+

https://www.snort.org/

POSIX-compliant implementation of /bin/sh

http://gondor.apana.org.au/~herbert/dash/

Typeface that melts text and data visualisation

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

Date and time library based on the C++11 (and beyond) header

https://github.com/HowardHinnant/date

Small and fast AV1 decoder

https://code.videolan.org/videolan/dav1d

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

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

Oracle Berkeley DB, Release 18.1

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

Oracle Berkeley DB, revision 5.3

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

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