Thief 3: Deadly Shadows

Please see the game's article at wikipedia for more game-related info:
http://en.wikipedia.org/wiki/Thief:_Deadly_Shadows

This game doesn't need any of the Source Ports, and, in fact, there are none of those for Thief 3, as there has been no source code released. However, a poor quality of the original textures have always been a point of criticism. John P.'s High-Res Textures pack solves this problem the best way.