classicube is pretty cool, open source Minecraft classic-like game (so, no crafting or survival aspects, limited world sizes)
Gaming
From video gaming to card games and stuff in between, if it's gaming you can probably discuss it here!
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I used to play openarena (Q3a ish) a lot. And we had some group games of freeciv. I never got torcs to work well enough to play. That would have been great and simulation would be the perfect kind of "game" to free / open source. And countless hours of nethack on every platform I had (which was a few). Other roguelikes too. Ones that actually are like rogue, that is. Even rogue.
But all that was a long ago. Should maybe explore more.
Thanks for the Veloren recommendation, I liked Cube World, it just didn't work out well.
Arguable if you can call it a game or not, but there is Overte. It is an open-source social VR platform. (without crypto so please no pitchforks)
As one of its developers I might be biased, but I wouldn't be one of the developers if I didn't honestly believe in the project.