Thanks for the Veloren recommendation, I liked Cube World, it just didn't work out well.
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Not quite what you are asking for, but here's a list of source ports of commercial games, most of which have Linux ports.
Oh and I'll single out The Ur-Quan Masters as an older source port of Star Control II. Old enough that the port itself is nostalgic for me, although it's still being updated by the looks of it.
Only one that comes to mind is Lugaru. The creator had this weird legal battle where someone stole the game, ported it to iOS, and the thief claimed because it was open source he was allowed to sell it.
Does City of Heroes count? It was closed source but was opened...
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.
Oh~ this game looks like someone was really disappoined by how cube worlds dev killed the release on steam i guess. Thanks for that, i will check it out. tl;dr Game was gutted on steam release but so much more was already done, promised and/or teased.
0 A.D. and Beyond All Reasons for me ^^
One of my absolute favorite games as a kid was Glest. Turns out it's open source and is now available as MegaGlest!
It takes a lot of inspiration from Warcraft but it has its charm and many of the races are quite unique in how you play them!
Technically not the whole game, but Smash Remix is an open source rom hack of the original Super Smash Bros. for the Nintendo 64. It's been a blast from the past and I'm enjoying the hell out of it.
I also love the fact that a lot of N64 emulators are open source too, like Mupen64 or simple64