House Vagoroth branched out into Soldier of Fortune and Soldier of Fortune II.  Look for the distinctive "hv" tag in the name of any SOF player.

In a nutshell, Soldier of Fortune is a first person shooter with an enjoyable single player campaign and an even better online multiplayer option.  In general, you play the role of the lone commando who uses mostly semi-realistic weapons to kill the bad guys and spare the hostages (and teammates in the multiplayer).  My favorite multiplayer version is arsenal, in which all players are pitted against each other in a death match environment and race to be the first person to kill someone with each of their different weapons.  There are also normal death matches, capture the flag and other variations.