LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
Odamex is a free, cross-platform, modern client-server Doom engine
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Utilities to make running a Linux Alien Arena server easier
Classic America's Army
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Gets status for Alien Arena servers
Suite of utilities for managing a Linux Xonotic server
Script to start up Nexuiz Linux server at boot time and if it crashes
Web based Game server control panel
Quake C mods and support - SSQC / CSQC
Battlefield bad company 2 Master server emulator + Server R34
The famous Maze War game recreated as a modern web application.
Cross platform administration tool for Source Engine dedicated servers
GraphOX is awesome
qscore is a suite of tools to parse Quake III: Arena games.log
Nexuiz-Xonotic Client