[illuminant]

I tend to prefer open source games, which there are a fair many of good quality.

I've spent a few thousand hours playing Return of the Precursors (rotp); turn based space strategy. First I played the readily available version for about a year, then I discovered the fusion fork which has me so addicted I sometimes loose entire days playing it over and over and over again. Note: you have to tweak the rules to get the perfect game. And you have to restart the game as soon as you know you're doomed, until you find a game where the random odds give you a fighting chance. The fusion fork is infinitely more challenging (and some tweaks make more intuitive sense.)

Warzone 2100 if you want real time strategic warfare (I beat the game by only building engineering units :] )

The Ur-Quan Masters is a great multi-mode space adventure.

The only games I've paid for recently are the old Wizardry games (6,7,8) which are throw back dungeon crawl and D&D style adventure.

[Innovatize]

Those games sound kinda fire - tysm for answering :D

Do you have any specific websites or ways you find those open-source games?

[illuminant]

A few are on steam (uqm, Wizardry) rotp is in most official Linux distros (apt install rotp), though the fusion version (which you should play after getting the hang of the original) you can Google and download from the repository release. Warzone 2100, may also have an official Linux distro though you can get the edge version from the repo (Google it).

Have fun!

[Innovatize]

Tysm :D

[daelon]

Are you aware of Beyond All Reason?

[illuminant]

Yes, though I can't figure out why anyone would play that over warzone 2100 ;p

It's been years, I should revisit.