Dwarf Fortress of course. Other good mentions are Factorio and Rimworld, if you understand them and are done with it, install a couple hundred mods and have a whole different game!

I like to use good ol’ stable Debian with i3-gaps as a window manager.

Artificial General Intelligence, a hypothetical AI, that has the capacity to solve every intellectual task a human can do.

It ain’t much, but it’s honest work!

Counter Strike: Source, maybe even Minecraft with different Techpacks