I still have an old WMR headset that sometimes I dust out and play, it was once the cheapest headset and still had a great time playing with it.
I know that WMR stands for "Windows" Mixed Reality but has there been any progress in porting it to Linux? Is there some kind of passthrough that enables it to work?
I would love to switch but I'd miss the little bugger.
I've only used steamVR headsets myself, but there is OpenHMD which enables at least some functionality on headsets such as the CV1.
The hard part is the 6DOF tracking. Gyros and accelerometers are easy, but constellation or SLAM tracking is another matter entirely, and all the existing code for that stuff is proprietary so it has to re-implemented.
Outputting an image signal, also easy, accounting for the optics on a given set to correct for lens distortion, hard.
I think the CV1 or the PSVR HMDs are the furthest along, and I don't see any WMR HMDs supported I'm afraid.