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.
A free 3D game engine to create games and realtimes scenes for Windows
Full featured MUD server with all the trimmings.
Orx: Portable Game Engine
Game engine supporting many 3D/2D formats and graphic effects
A conservative source port of Heretic that is identical to DOS
A conservative source port of Hexen that is identical to DOS
Visual Basic 6 2D online adventure game engine
A simple cross-platform game engine for creating old-school 2D games
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
RPG dice roll simulator for vintage Tandy TRS-80 100/102/200 laptops
A fast, scalable, distributed game server engine/framework for C++