Old Unreal Multimedia Update
http://www.oldunreal.com/utpatches.html
NOTE: The audio driver included with this patch needs to be whitelisted (I created a topic about this actually and I'll private message Shiva shortly) before you can use it online, else ACE will kick you from the server. You can still have it installed without being kicked, but you'll need to instead have the default Galaxy 3D driver enabled instead. To enable the new sound driver included with this, you'll need to type "preferences" into your console, tick the drivers box, and select ALAudioSubSystem for your audio driver.
New OpenGL renderer
http://www.cwdohnal.com/utglr/
NOTE: Open your console and type in "preferences" to tweak each individual option on it. You'll find these options when you tick the box next to rendering. Make sure you enable S3TC and set the frame rate limit to 200 or lower.
Unreal Tournament Retexturing Project
http://www.uttexture.com/UT/Website/...lesHighEnd.htm
NOTE: YOU WILL NEED A NEW RENDERER WITH S3TC ENABLED TO USE THESE TEXTURES OR YOUR GAME WILL CRASH! Make sure you have that taken care of BEFORE you install these. Also, back up the Decayed S package from your textures folder just in case you have a mismatch issue.