Today is quite a milestone for Google Web Toolkit: with the GWT 1.3 Release Candidate, our team is very happy to announce that all of GWT is open source under the Apache 2.0 license. There's a lot to say, but let's start with our mission:
"To radically improve the web experience for users by enabling developers to use existing Java tools to build no-compromise AJAX for any modern browser."
Google Web Toolkit 1.3 Release Candidate is 100% Open Source.