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> AssaultCube
http://assault.cubers.net/
Easy to get into, in my opinion the closest you can get to a FPS+MOBAs while still making a good game.
Past its golden age apparently, some speedbots here and there.

> Xonotic
http://www.xonotic.org/
Fun as all hell with people, bots are good for getting a hang of it.
Mods expand on it with vehicles. Bring your friends.

> ChaosEsque Anthology
https://sourceforge.net/projects/chaosesqueanthology/
A fork of Xonotic.
Haven't actually played it, just putting it out there without the devs' pasta

> GLOOME
Completely free rendition of the GZDoom engine.
First project is Nocturne in Yellow, by the guy who made DemonSteele. Albeit with an underwhelming start, great gameplay and neat design ideas hooked me in full. png(s) related.
https://github.com/marrub--/GLOOME/