THE DARK MOD was once a total conversion of Doom 3, and is now a STANDALONE GAME with the release of TDM 2.0! A dark and moody stealth game, inspired by the Thief series by Looking Glass Studios.
Images from Fieldmedic's (long awaited, and extra large) mission "Not an Ordinary Guest" (which is also an Unusual Contest entry) courtesy of AluminumHaste. It's really three-missions-in-one with an Assassin Mode, Thief Mode, and Saboteur Mode.