Virtual reality music sandbox Soundstage VR (Steam) for HTC Vive and Oculus Rift is being rendered free and open source, according to an announcement issued by the developer today. It seems it is due to the developer being hired by Google.
SoundStage is now open source! We will be removing the app from the Steam store in the coming week. The app and source code are now available on GitHub. You can check it out here: https://github.com/googlearchive/soundstagevr