Primrose VR
The Primrose Framework helps web developers create virtual reality experiences within standard web browsers, on desktop and mobile devices alike, using the free, open source web development tools with which they are most familiar.
Code Libraries: Virtual Reality
A-Frame
A web framework for building virtual reality experiences on the web with WebVR and HTML.
Babylon.js
Babylon.js is a complete JavaScript framework for building 3D games with HTML5, WebGL and Web Audio.
Vizor
Vizor is a content portal for virtual reality projects available in the browser. It is also a powerful dataflow programming toolset to aid in the creation and distribution of VR experiences (WebGL and WebVR).