I use it with an IRC client. There are some things I take issue with (mainly stripping out IRC color control characters), but it works really nicely as a client. I use Irssi so if I need to ignore it, I can tuck it nicely away in a screen session somewhere and put my focus elsewhere.
I can play the UT2003 native version for linux just fine (doesn't seem to play nice with amdgpu, but the intel driver seems to be fine).