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I asked this a while ago which is how I discovered Beyond All Reason which has been my FOSS game of choice as of late.
I'd also recommend Naev and Endless Sky (Both are based on the Escape Velocity Series, Naev is getting a 3D PBR renderer in the next release). Mindustry is good fun, actually purchased this one on steam to support the amazing developer. Extreme Tux Racer is a bit of fun and Super Tux Kart seems to get better with every update (did I mention it can run on the Nintendo Switch via homebrew!)
Edit: I forgot about 0ad and Minetest which I used to play a bit of a while back
BAR is great -- Total Annihilation was always one of my favorite games from childhood and BAR feels the most like it compared to other spiritual successors like SupCom/FA and other community projects. I actually tried to contribute a couple commits to the project but I don't think they took them.
I also found bar from an open source thread on Lemmy. It's such a good game. You a cortex or Armada player?
I've only been spamming cortex I haven't tried arm yet.
Quite the opposite—I've only played Armada, not that I have any real strategy to speak of buy I like to set up lots of radar as well as claim the airspace early then once I've built the nuke the game is pretty much won. Haven't tried that on a real player yet though