Odamex is a free, cross-platform, modern client-server Doom engine
Opensource Created Custom Viewers For Virtual Worlds like SecondLife.
Extra image set for Crossfire RPG Game
New version of PTkEI2, the cross-platform GUI client for Wolfpack Empi
Free MMORPG
Updated client for Battletech MUX game servers
QuakeWorld client ported to OS/2
Star Trek Web browser game
A multiplayer First-Person-Shooter game built in Java 3D
Multi-user whiteboard emphasizing simplicity.