OK, help me out here. I'd love to hear people are still regularly playing Unreal Tournament, but it feels more likely that's not what you meant and I'll go crawl into a hole.
Though development is long dead, the servers were taken offline and it was delisted by Epic, people are still playing the Unreal Tournament pre-alpha (commonly called UT4) which you can get here: https://www.ut4ever.org/downloads
The download should come with the unofficial update which gives access to the private servers, I play on the Unreal Carnage servers regularly which often gets 8-15 players at a time, more than enough for some deathmatch. Would love to see some more people around!
(Mind I'm in New Zealand, which is why my ping is so high, the netcode handles it well somehow)