Did you guys tried Endless sky? Awesome game if you love space
And minetest+mineclone2 is pretty good if you want to play minecraft but don’t have a license
Cataclysm DDA Is THE open world zombie survival experience. So long as you like obtuse roguelikes with nearly no graphics.
Although Im obviously biased what with being a dev and all.
I haven’t seen any incremental games get posted. They aren’t exactly traditional games, but so many of them are open source like Antimatter Dimensions or Synergism. Bitburner is a unique one as an incremental hacking sim, since it relies on actual scripting to grow and automate tasks.
Cataclysm: Dark Days Ahead
Veloren
Beyond All Reason
https://www.beyondallreason.info/
It a grand scale RTS game with robots and insects loosely inspired by Total Annihilation.
OpenRA has open source slightly modernized versions of Red Alert, Tiberian Dawn and Dune 2000. There’s also Tiberian Sun-like and Red Alert 2 mods for it :)
I haven’t been involved in the project for a decade or so but I was one of the founders of OpenRA, so thanks for recommending it! I’m very happy it’s still actively developed nearly two decades later.