scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A refreshingly simple data-driven game engine built in Rust
A modern, cross-platform Quake game engine based on FitzQuake.
Full featured MUD server with all the trimmings.
Game engine supporting many 3D/2D formats and graphic effects
Orx: Portable Game Engine
A conservative source port of Heretic that is identical to DOS
A conservative source port of Hexen that is identical to DOS
Ze Text Adventure game Builder : Create as you play !
Fork of AbuseSDL to carry on development
Conservative port of BOOM 2.02 to modern systems.
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
DOOM / Heretic / Hexen source port with enhanced graphics and UI
2D Game Engine
A fast, scalable, distributed game server engine/framework for C++
Cross-platform 2D and 3D game engine
online 4X browser game engine
Game engine allows you to create own MMORPG
Paintown is a 2d fighting game engine.