An authentic Rise of The Triad Dark War source port
A conservative source port of Hexen that is identical to DOS
A conservative source port of Heretic that is identical to DOS
A Tile-based Game Engine written in C# mimicing retro consoles.
Retro game engine for creating games like it's 1997
Conservative port of BOOM 2.02 to modern systems.
A fork of Chocolate Doom with small Quality of Life enhancements
A fork of dhewm3 with an emphasis on modernisation and vanilla Doom 3
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
a UCI chess engine
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
DOOM / Heretic / Hexen source port with enhanced graphics and UI
An open source re-implementation of Diablo 2
KlayGE is a cross-platform open source game engine
Opensource Game Studio
Free and Open Game Programming Language for Windows and GNU/Linux
Low-Level Game Engine for Retro Platforms
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons
Portable game engine with main focus on point-and-click adventures