Smart GWT is a GWT-based framework that allows you to not only utilize its comprehensive widget library for your application UI, but also tie these widgets in with your server-side for data management
SmartGWT is based on the powerful and mature SmartClient library. SmartGWT provides a wide-array of rich components that are based on GWT. In addition to SmartGWT LGPL, Pro & Enterprise editions of Smart GWT are available with additional features & tools, as well as commercial support.
SmartGWT is compatible with GWT 1.5.3, GWT 1.6.4, GWT 1.7.x and GWT 2.x
More info at : www.smartclient.com/smartgwt/