Lords of Death Forums Lords of Death Forums LoD FPS/RTS/MMO/Console - Public doom 3 in two weeks....

It has multi-player support. (4 players only) PCgamer says it has deathmatch, team death-match, tournament, and last man standing with 5 maps included.
Review in PC Gamer is pretty stellar. I don't usually play FPS but this may be worth it.