https://thenextweb.com/google/2019/11/07/google-open-sources-cardboard-vr-after-killing-its-daydream-project/

After killing its ambitious Daydream VR project last month, Google is making the Cardboard VR project open source.

The company said the code repository includes features such as APIs for head tracking, lens distortion rendering, and input handling, for developers to build Android and iOS apps designed for Cardboard VR experiences.