plainVR

This app lets you view 360º images and videos via URL address.
You can use any equirectangular image or video as source if it has public availability on Internet. You can even directly add 360º videos from Youtube!
You can also share links for your images or videos added in your app to social networks, instant messaging clients, etc.

If you have a cardboard, you can use full immersion mode and navigate between distinct scenes, and enjoy with a full VR experience.