dhewm 3 main repository
A modern, cross-platform Quake game engine based on FitzQuake.
GemRB is a portable open-source implementation of the Infinity Engine
SDL based generic 2D game engine
Orx: Data-Driven Game Engine
A cell-based puzzle game featuring classic and completely new puzzles
PyCAPGE - Python Classic Adventure Point and Click Game Engine
2D game development library for Ruby and C++
An authentic Rise of The Triad Dark War source port
A conservative source port of Wolfenstein 3-D
A conservative source port of Hexen that is identical to DOS
A conservative source port of Heretic that is identical to DOS
Fork of AbuseSDL to carry on development
Conservative port of BOOM 2.02 to modern systems.
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
scriptable game engine with built-in support for 2D graphics and sound
Multi-platform game engine similar to old Megaman with a stage editor
2D game engine for traditional platform games
An advanced flexible game engine for Java.
A 2D Adventure Game & Engine