Password-checking library

https://sourceforge.net/projects/cracklib/

Simple Minecraft clone written in C using modern OpenGL

https://www.michaelfogleman.com/craft/

Linux Compressed ROM FileSystem

https://sourceforge.net/projects/cramfs/

CRC32C implementation supporting CPU-specific acceleration

https://github.com/google/crc32c

Fonts created from by Google for ChromeOS to replace MS TTF

Font created by Google for ChromeOS to replace MS Cambria

https://code.google.com/p/chromium/issues/detail?id=168879

Font created by Google for ChromeOS to replace MS Calibri

https://code.google.com/p/chromium/issues/detail?id=280557

CrowdSec lightweight and collaborative security engine

https://github.com/crowdsecurity/crowdsec

CrowdSec Blocklist Mirror

https://github.com/crowdsecurity/cs-blocklist-mirror

CrowdSec bouncer written in golang for firewalls

https://github.com/crowdsecurity/cs-firewall-bouncer

Encrypted filesystem for FUSE

https://BSDforge.com/projects/sysutils/fusefs-cryptofs/

Free C++ class library of Cryptographic Primitives

http://www.cryptopp.com/

Interactive C program browser

http://cscope.sourceforge.net/

SKK (Simple Kana Kanji henkan) library

https://github.com/naokiri/cskk

Sound synthesizer

https://csound.com/

Utility for Shogakukan Random House English-Japanese Dictionary

http://openlab.ring.gr.jp/edict/

Feature-filled tagfile generator for vi and emacs clones

http://ctags.sourceforge.net/

Generate, receive and apply FreeBSD source updates per mail

https://github.com/freebsd/ctm

BitTorrent Client written in C for FreeBSD and Linux

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

Package for the manipulation of Binary Decision Diagrams (BDDs), etc

https://davidkebo.com/cudd

Automated unit testing framework for C

http://cunit.sourceforge.net/

Common UNIX Printing System

https://www.cups.org/

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.haxx.se/

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

https://www.cvshome.org/

cvs-server only shell

A 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

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

Lightweight C++ command line option parser

https://github.com/jarro2783/cxxopts

Bitstream Cyberbit TrueType font that covers Unicode 2.0

http://www.bitstream.com/

Cyrillic X11 bitmap fonts from CYR-RFX project

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

RFC 2222 SASL (Simple Authentication and Security Layer)

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

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

http://www.cython.org/