Head tracking is a gamechanger for flying or driving games. I’ve used opentrack successfully with Star Citizen via lutris but have been struggling to get it working for steam games. LookPilot seems to work well and is fairly cheap but isn’t FOSS. I know there are loads of other alternatives so I’m wondering what have you found that works well?
LookPilot might not be FOSS but it just works in my experience.
The most I’ve had to do once, for Arma 3, was change my compatibility to Proton instead of the CachyOS version. Other than that it’s just been plug and play.