Underworld Bloodline is a team-based multiplayer mod based on the Sony action movie "Underworld". Rival clans of Vampires and Lycans (werewolves) fight each other while trying to secure a human that hides the power to make them invincible. The gameplay can be described as a mix between Hostage Rescue and Capture the Flag, but the maps are a lot larger and more complex, offering opportunities for a wide range of strategies, such as snipering from inside buildings or taking shortcuts by jumping between rooftops.
Wow I forgot about this one. This seems to be the most recent work that Black Widow Games has done. It's a pity that we won't see They Hunger source or maybe even a USS Darkstar Part 2. Anyways, this mod's cool and I hope BWG reunites someday, though I doubt it.