The Doomsday engine is a nice engine that allows you to play Doom games in 3D
Doomsday Engine download
Configures your SteelSeries items, like the keyboard, mice, headsets.
Revolutionary map editor for Doom and games based on the Doom engine.
Stream you gameplay.
Hexic Deluxe 9.2 was developed by the minds behind Tetris.
It allows you to play Doom online using modern engines.
Free 
