You can download either windows, linux, or mac UT server software from:
http://www.unrealtournament.com/ut20...ads.php#Server
It says demo but it comes with a ton of stuff, more than enough for local games.
There is also an open source port of UT project going on:
http://openut.sourceforge.net/
This site has a ton of downloads and material for setting up your own UT server in linux:
http://www.planetunreal.com/TheAdmin...inuxServer.htm
If you have any other questions send me an email,
-Karl