joshwcomeau/beatmapper
Beatmapper is a map editor for Beat Saber, a VR rhythm game. It allows you to create your own maps, for use in the game. Unfortunately, I've had to put Beatmapper on the back burner. I do hope to resume work on this project in the future, but for now, you may wish to use an alternative editor.
https://github.com/joshwcomeau/beatmapper
