Google Cardboard:You’ve already got the YouTube app on your phone, and it’s one of the most important Cardboard apps. Just search for “360 video” and you’ll uncover an enormous (and ever expanding) range of content optimized for VR viewing.
Cardboard Camera: Create your own images for use in Google Cardboard (iTunes and Google Play)
Google Street View: Explore world landmarks, discover natural wonders, and step inside locations such as museums, event arenas, and small businesses with Street View (iTunes and Google Play)