I found this extensive GWT widget developed and licensed under GNU. From the all the GWT frameworks I have seen, this is the best one so far. It has over 260 showcase features and it is open source!. One of the biggest strength of this framework is the support for data integration/binding. GWT is an amazing tool. However, it doesn't have much of built-in framework for form validation/binding. Writing the code for data binding/validation in GWT can consume a lot of time. SmartGWT has amazing API functions to deal these obstacles with just a couple lines of code!
Look at the show case below:
http://www.smartclient.com/smartgwt/showcase/#add_grid_form_category
Pay close attention to Grid-Form-Binding. Writing GWT CRUD screen with SmartGWT sounds like a piece of cake!
For more information:
- Google code: http://code.google.com/p/smartgwt/
- Showcase: http://www.smartclient.com/smartgwt/showcase/
