Doomsday Engine is an open source, portable game engine for classic first person shooters. Doomsday supports many games including the classic first-person shooters DOOM, Heretic and Hexen. Lets you enjoy the original games using modern technology, including high-resolution OpenGL graphics, 3D models, and dynamic lighting effects. The Doomsday Engine is available for Windows, Mac OS X, Ubuntu and most other Unix platforms. Doomsday Engine Features OpenGL based renderer Dynamic ambient occlusion (corner shadowing) for world surfaces Dynamic lights with halos and lens flares Dynamic shadowing effects for world objects 3D sound stage for positional effects Environmental echo and reverb effects High-resolution textures: PNG, JPG, TGA, PCX 3D models: MD2, DMD with LOD support Clients can join games in progress Up to 15 player games and many more Doomsday Engine 1.