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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Xonotic is very polished and has an active community https://xonotic.org/
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.