"The Dark Mod" - Now Standalone
The Dark Mod is a stealth mod/toolkit inspired by the Thief games, previously made for Doom 3. It is now completely standalone so anyone can play it!
It's basically a toolkit for modders to make their own stealth missions or games. There are over 60 user-made missions already in existence, including some small campaigns. The mechanics are excellent, so hopefully someone will come along and make some very impressive free stealth game.