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.
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
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
Beyond All Reason
https://www.beyondallreason.info/
It a grand scale RTS game with robots and insects loosely inspired by Total Annihilation.
Veloren