Download Open Source Google Web Toolkit

The Google Web Toolkit is a free toolkit by Google, as part of the Google Code initiative, to develop Ajax applications in the Java programming language. GWT supports rapid client/server development and debugging in any Java IDE

From the project home page:
Google Web Toolkit (GWT) is an open source Java software development framework that makes writing AJAX applications like Google Maps and Gmail easy for developers who don’t speak browser quirks as a second language. Writing dynamic web applications today is a tedious and error-prone process; you spend 90% of your time working around subtle incompatibilities between web browsers and platforms, and JavaScript’s lack of modularity makes sharing, testing, and reusing AJAX components difficult and fragile.

GWT lets you avoid many of these headaches while offering your users the same dynamic, standards-compliant experience. You write your front end in the Java programming language, and the GWT compiler converts your Java classes to browser-compliant JavaScript and HTML.

Google Web Toolkit Features

• Dynamic, reusable UI components
• Really simple RPC
• Browser history management
• Real debugging
• Browser compatible
• JUnit integration
• Internationalization
• Interoperability and fine-grained control
• Completely Open Source

=> Download Google Web Toolkit for Windows/MAC OS X/Linux (Apache 2.0 license).