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?
“old and obscure” tends to be where Linux shines. It’s possible the driver is already in-kernel. What is it?