[game engine] The CRX game engine is an opensourced, cross platform program that was derived from id Software`s GPL code releases by COR Entertainment. The engine is primarily used for the game CodeRED: Alien Arena. The engine makes use of Quake II data formats such as .md2 and the BSP map format as well as others such as the skeletal Inter... Found on http://en.wikipedia.org/wiki/CRX_(game_engine)