Simple, universal VR application to test a headset's effective field of view
Read the instructions here:
https://github.com/phr00t/hmd-fov-tester/blob/master/instructions.txt
The built application is in dist/:
https://github.com/phr00t/hmd-fov-tester/tree/master/dist
... make sure to grab the JAR & the lib/ folder, which the JAR will need. Java 8+ required.