I personally really like Open Arena but Xonotic is good too.
I like the fast paced multiplayer fps feel of Quake like games.
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You could give https://www.redeclipse.net/ a try.
There was a realism mod for Quake 3 called “Urban Terror”.
The game was amazing back in the day, though I’m thinking the playerbase would be real small today.
Xonotic is very polished and has an active community https://xonotic.org/