GWT-Ext

Source: http://gwt-ext.com/ (official site of GWT-Ext)
GWT-Ext is a powerful widget library that provides rich widgets like Grid with sort, paging and filtering, Tree’s with Drag & Drop support, highly customizable ComboBoxes, Tab Panels, Menus & Toolbars, Dialogs, Forms and a lot more right out of the box with a powerful and easy to use API. It uses GWT and Ext.

GWT-Ext 2.0.5 has been released. Grab the distribution from the Downloads area. GWT-Ext 2.0.5 supports GWT 1.5 final (1.5.2), Firefox3 and Chrome.

Note that GWT-Ext only supports Ext 2.0.2 that has a LGPL license option.

The download link for current latest version of GWT-Ext (GWT-Ext 2.0): http://gwt-ext.com/demo