Extjs
Sencha Ext JS is a JavaScript framework for building rich Internet applications (RIAs).
Gxt
GXT, also known as Ext GWT, is a dual licensed component framework that seeks to provide similar functionality to ExtJs for Google Web Toolkit (GWT) applications.
Others
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I have worked pretty heavily with both flavors of the gwt extjs libraries though i ve spent more time with gxt recently from question Gwt libraries |