Thanks to the Quake engine being open source and LordHavoc's source port we have a very efficient VR shooter running on all VR devices, like the Oculus Go.
https://quakewiki.org/wiki/DarkPlaces
Love seeing LordHavoc mentioned. I collaborated a little bit with LordHavoc while helping build the open source shooter game Nexuiz (~2004-2005) and he is truly a brilliant game engine programmer!