Unity 5, the long waited "WebGL ready" version was released in early march 2015 and looks like it will be a fundamental tool for the imminent Web3D/WebGL revolution. We have worked with Unity 5 and updated our previous beginners tutorial to the current Unity 3D:
1- Unity 3D Easy first Scene (updated to ver. 3 in 5-Feb-2016)
The aim is to assemble a virtual scene, in the style of the classic VRML worlds, with all the base elements including avatar navigation.