After Google's acquisition of Instantiations, WindowBuilder (winner of the 2009 Eclipse Community award for Best Commercial Eclipse Tool) was contributed to the Eclipse open source community (http://www.eclipse.org/windowbuilder) and is now a thriving open source project. Now the most powerful Java UI builder in the world is freely available for any Eclipse developer to use and extend and has been recently updated to support Juno and Eclipse e4.
Everybody knows : Web is the platform of the future. Developing for the browser unfortunately requires us to learn and write JavaScript. Not only that but we also have to integrate the JavaScript client code with the server side, which often runs on the JVM (i.e. is written in Java). So we have to work in two different languages with completely different tools and APIs, and cannot share code between the client and the server.