Full featured MUD server with all the trimmings.
The multiplayer game engine
DOOM / Heretic / Hexen source port with enhanced graphics and UI
An online multiplayer turn based strategy game and board game engine.
Java decentralized cross-platform network multiplayer game engine
Built to be ease of use, with no programming knowledge, Multi-platform
Open Source 3D Game Engine
A 2D Adventure Game & Engine
TurboSphere is an easy to learn and powerful JS based game engine.
A multiplatform game engine for interactive fiction experiences
Open source, moddable game engine for the "Polygon Love 2" game