The Graphical Editing Framework (GEF) enables developers to create client-side rich graphical editors based on existing domain models.
In the past building interactive box-and-arrow applications has mostly meant being limited to running them on the desktop. Moving them to the browser required a significant re-write and was only possible after severely limiting the application's capabilities.
Inspired by Eclipse RAP, we have been working on supporting the Eclipse GEF APIs in the browser. The goal is to enable an easy transition of GEF-based client applications to the web and support fully functional visualization applications in the browser.
See http://www.architexa.com/labs#gef for more information on our work.