3Dstudio Max, Zbrush, Mudbox, Photoshop and xNormals. The UT3 engine is the same engine as Gears of War and is pretty much capable of everything, a Total conversion infact. Here's an example of the UT3 engine looking pretty.
http://linux.softpedia.com/screensho...3-Server_1.jpg (picture res is too big)
http://www.fileplanet.com/promotions...ns/screen1.jpg
Both ingame screenshots.