Best mods for co-op gaming

Co-op Warfare
Game: FEAR

This is more of a corruption of the existing FEAR multiplayer game, so if you're looking for a co-op slow-mo battle you're in the wrong place. The current game enables you and your friends to join up against the clever bots. However, while previous iterations enabled players to fight through FEAR's singleplayer maps, version 0.6 is a tad broken in that respect. Co-op Warfare also works with the free FEAR multiplayer component, Combat, so you've got a full free co-op game here if you want it.