@968d22da @e12630d3 pretty much every engine that targets steam uses openvr on the backend, so vr suport should be fairly identical to anything implementing it. ( for the big names Unity/Unreal/Godot/Cryengine and lumberyard all use it as the backend)

https://github.com/ValveSoftware/openvr/wiki/API-Documentation

Support for other api's like the Oculus proprietary one is going to vary a lot more though.