GemRB is a portable open-source implementation of the Infinity Engine
A cross-platform port of Hexen II game.
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realistic driving simulation + functions for 2D/3D graphics
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Tao3D is a programming language for real-time interactive 3D
3D driving simulation based on Open Dynamics Engine
A traditional top-down OpenGL car racing game
Just a G. U. I. for Prboom / Prboom-plus
Cross-platform port of Arx Fatalis, a first-person role-playing game
Game engine supporting many 3D/2D formats and graphic effects
A powerful cross-platform and open-source 3-D rendering engine.