Similar to Ring_(プログラミング言語)

BSD libc

Budgie (desktop environment)

C-Store

Cacti (software)

Caddy (web server)

CakePHP

Capistrano (software)

Ccache

Cdb (software)

Cdparanoia

Cdrkit

CERN httpd

Cervisia

Cgroups

Checkstyle

Progress Chef

CherryPy

CKEditor

Clonezilla

Cloud Foundry

CMake

CMU Common Lisp

Coccinella (software)