FlightGear now supports OpenXR... somewhat.

Another feature added to FlightGear post 2020.3 is initial preliminary support for OpenXR, i.e. using VR headsets and so forth with FlightGear! It doesn't work very well though...

Help support local hospitals in my country!: https://ko-fi.com/dordekkiddy

Get FlightGear 2020.3 lts: https://www.flightgear.org/

FlightGear is the free PC flight simulator under GNU GPL. It runs on Windows, Linux (Ubuntu, Red Hat...) and even Mac! It also has multiplayer support, something a lot of simulators have dropped. ... https://www.youtube.com/watch?v=6_wRrQYWfPU