[reputet]

Both Quake3e and ioquake3 are engines, but not the game. To play, you still need pak0.pk3 file which is not free. It is included if you buy the game. Bethesda [1], GOG [2], Steam [3].

[1] https://bethesda.net/ru/store/product/QU3CSTPCBG01

[2] https://www.gog.com/game/quake_iii_gold

[3] https://store.steampowered.com/app/2200/Quake_III_Arena

[gogopuppygogo]

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

[znpy]

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

[jimbob45]

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

[gsich]

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

[dorgo]

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

[reputet]

Not sure, but it works from US.

[shdh]

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