The plug-in applicatios WebGL Export-Publisher is offered as a 30-day trial version and after the trial period it can be licensed via the vendor's site. The price of the license is 30 Euro.
Similarly to other Exchange Apps tools, this application is very very simple to install. The plug-in is installed directly into the Revit environment, where you can run it from the "Add-ins" tab. You can begin to export your models using a simple dialogue.
The application is very easy to use, to setup and to create exports. The output data is graphically pleasant, and it can be used as a presentation of your projects on the internet. You can judge yourself in the sample video:
L.Stanik, CAD Studio