Recently as a labour of love Leo_TCK has been resurrecting as much of the game as possible. You can get the first part of it here (though you'll also need a copy of the original unreal tournament as well - the current version on steam works well):

http://www.moddb.com/mods/unreal-psx-rework-rise-of-jrath

I think it’s incredible that there are individuals out there s dedicated that they’ll spend their own time on ensuring that these forgotten programs still survive in some form.

You can find out more about it the resurrection of the PSX version and even download the first few levels and see what they were like.

The gameplay is still a bit rough and unpolished, more so in some areas, but this work in progress and not yet intended for release. These problems would have been easily sorted if the project had gone to completion.

Below is a taster from YouTube.