GzDoomVR code under GPL licence can be found
here: https://github.com/lvonasek/GZDoom-Android
The app contains Doom 1 shareware wad under this licence:
https://raw.githubusercontent.com/ChrisJan00/WarrensDream/master/doom-wad-shareware-license.txt
The app contains Doom 1 shareware wad under this licence:
https://raw.githubusercontent.com/ChrisJan00/WarrensDream/master/doom-wad-shareware-license.txt