Odamex is a free, cross-platform, modern client-server Doom engine
Cross-platform real-time strategy game (3D)
Snakes of Apocalypse is a funny multiplayer game
Java decentralized cross-platform network multiplayer game engine
The All-in-One music game
An HTML web game platform
Damage calculator and items comparison tool for Diablo 3
A arcade based tycoon game where the player builds and sells computers
Browser based platform for playing CCGs