Blender to Babylon.js exporter

Installation

Download the latest version.
Goto Blender User Preferences from the File menu.
Switch to the Add-ons tab.
Click the Install from File... button at the bottom.
Select the zip file. Do not expand. Blender does that.
Switch to the new Category now added, Babylon.JS
Enable the exporter using the checkbox.
Click Save User Settings if you wish it enabled every session.

Documentation

See the exporters documentation for a list of features, some tips and others.

Tower of Babel extension can be found here.