1) Video game engine 
XnGine was a 3D engine developed by Bethesda Softworks. In 1997 support for higher resolutions was added and in 1998 it was made compatible with 3dfx graphics cards. The Terminator: Future Shock was the first game to use the engine, and also the first 3D PC game to use the now popular mouse-look interface, which was initially unpopular with gamers...