Cardboard

Cardboard puts virtual reality on your smartphone. The Cardboard app helps you to launch your favourite VR experiences, discover new apps and set up a viewer. The app is now built on the Cardboard open-source software (OSS) SDK.
To fully enjoy this app, you’ll need a Cardboard viewer. Learn more and get your own Cardboard viewer at http://g.co/cardboard. To learn more about the Cardboard open-source project, visit our GitHub repository at https://github.com/googlevr/cardboard.
By using this app, you agree to be bound by our Google Terms of Service (Google TOS, http://www.google.com/accounts/TOS), Google’s general Privacy Policy (http://www.google.com/intl/en/policies/privacy/) and the additional terms below. This app is a Service as defined in the Google TOS. The terms regarding software in our services apply to your use of this app.
Do not use this app while driving, walking or in any way that distracts you from real-world situations and prevents you from obeying traffic or safety regulations.