GPL Doom 3 game engine

 The goal of dhewm 3 is bring the DOOM3 engine with the help of SDL to all
 suitable platforms.
 .
 This game engine is compatible with the original Doom3 data files and the
 Resurrection of Evil extension. To play it, you need to own the game data.
 .
 Bugs present in the original DOOM 3 will be fixed (when identified) without
 altering the original gameplay.