Rcon client for Minecraft
Xash3D FWGS engine
A free/open source client and automation tool for Ragnarok Online
An open-source Phantasy Star Online server for *nix
3D Multiplayer Hover Soccer
A promising chess program
Retro game engine for creating games like it's 1997
Console based rcon client for minecraft servers.
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Crossfire RPG Game Weather Patch -- Now a branch on the official repo!
Free MMORPG
Based on the raedwulf-et project
Quake C mods and support - SSQC / CSQC
Simple meta-server for locating other multiplayer servers
The IRC's Talking Robot
Cross platform administration tool for Source Engine dedicated servers
Minecraft clone written in C using modern OpenGL
A simple telnet (and possibly SSH) server
Quake III Arena GPL Source Release