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Open Arena is an open source shooter based on the original open source quake 3 engine that you can play without licensing the original creative work: https://en.wikipedia.org/wiki/OpenArena

I used to like OpenArena, but there often is a lot of cheating/aimbotting and no one ever does anything.

You could conceivably download the demo and use that too, right?

You can, but it doesn't have all assets.

[2] Doesn't work for me. I get redirected to https://www.gog.com/games?page=1&sort=popularity. Is it geo blocking?

Not sure, but it works from US.

You can still play standalone mods with q3e or ioq3 and not need baseq3.