Files:
Download ut-server-436.tar.gz - UT99 Server for Linux
Download OpenGLDrv.so - Linux port of the UTGLR renderer
Download UT99-Demo.zip - UT99 Demo
Download UTPatch436nodelta.exe - UT99 436 Patch

Links:
GameTracker
UT-Files.com
UTGLR
UTPG