Thievery is a very nice game based on Thief series, made of Unreal Tournament. If you haven't played it yet, you should do it as fast as possible. It is very nice looking game, which have alot in common with Thief series. There are many maps and types of games.
I have no doubt that you are interested. If you want to look for things yourself click here, or if you want direct links for proper things go to Download topic.