Kitana's Castle - Offers two public servers. Includes player rankings, map downloads, rules, and forum. - http://www.kitana.org/cgi-bin/cq.exe?/arena/unreal/ranking.html
uReel - Group using the Unreal engine to create Machinima films. - http://www.ureel.org/
Neoseeker - Offers cheats, links, screenshots, and a discussion board specific to the PS2 version. - http://www.neoseeker.com/Games/Products/PS2/unrealtournament/unrealtournament_cheats.html
Loki - Linux port of the game. - http://www.lokigames.com/products/ut/
Skully's World - Includes animated and non animated graphics, original art, and a forum. - http://skully333.50megs.com/