Vrais allows you to view 360 degree, stereoscopic environments on Cardboard viewers. And rendering content for it is straightforward with this tutorial by Sebastian König.
One of the newest additions to Blender is the ability to render stereoscopic equirectangular VR images in Cycles. Here’s a short guide how to setup Blender for VR rendering. To view the finished result I use the Google Cardboard and our own little App called VRAIS - VR Awesome in Space. We developed the app as a tool for out studio workflow but also as a community based VR Gallery. You can find out more about it here: vrais.io.