What is GWT (Google Web Toolkit)?
GWT is a development toolkit for building and optimizing complex browser-based applications. GWT is used by many products at Google, including Google AdWords and Google Wallet. It's open source, completely free, and used by thousands of enthusiastic developers around the world.
GWT (Google Web Toolkit) Screenshots
GWT (Google Web Toolkit) information
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Said about GWT (Google Web Toolkit) as an alternative
Vaadin is built on top off GWT