The complete suite is:
- GWT Designer
An Eclipse-based development tool that enables Java developers to create Ajax user interfaces using Google Web Toolkit (GWT)
- CodePro AnalytiX An automated software code quality and security analysis tool.
- WindowBuilder Pro
Java graphical user interface designer for Swing, SWT, GWT, RCP, and XWT UI frameworks
- WindowTester Pro
Test GUI interactions within Java client rich applications for the SWT and Swing UI frameworks
Google has plans to improve the integration with the GWT SDK in later versions.
You can download any of the tools from the GWT download page.