For those of you looking for a multi-user web renderer for Eclipse 4 RCP application, you don’t have to look further: Vaaclipse homepage.
Vaaclipse is a framework for building web applications using Eclipse 4 Platform and Vaadin. It allows to use the power of the Eclipse 4 in web development.
Pretty impressive what they are doing.
You find more information about the renderer framework in Eclipse 4 here: Eclipse renderer tutorial.