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Some other good ones: Minetest (FOSS clone of Minecraft) 0 A.D. SuperTuxKart
The only thing checking all the boxes i can think of right now is Mindustry. It's available on Steam, itch.io and Github and it's a great game.
I know you say no FPS. But hear me out. Freedoom with gzdoom is argueably the most moddable game in existence. Not to mention, being the first game (Doom) to support mods, and the first commercial game to become open-source. There's a wealth of level editors and tools around it. Despite being from 1993, commercial games are still made with this engine.
Also https://godotengine.org is a great Linux tool