A web component for stereo 3D pictures with VR support (GitHub).
It supports VR Photos (VR180, Google Camera panorama, Cardboard camera), left-right, anaglyph...
See stereo-viewer.com for a stereo image viewer web app using this component.
Demo
(or use left/right keyboard keys, or in VR the triggers or the thumbsticks of the controllers)
These are best viewed in VR, click "Enter VR" if your device supports VR.