ICEfaces also released as opensource under the Mozilla Public License, on this Tuesday :).
ICEfaces is a profoundly powerful extension framework for JavaServer Faces which provides excellent Ajax integration with no heavy lifting. This extends JavaServer Faces, enabling Java developers to more easily create and deploy thin-client rich Web applications in Java technology. ICEfaces applications are Java technology based applications, not JavaScript applications
Technorati Tags: ICEFaces
Orange Slate 
Google is the best search engine