GWT

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Get flash to fully experience Pearltrees
Google Web Toolkit provides a set of tools that can simply be used with a text editor, the command line, and a browser. However, you may also use GWT with your favorite IDE. Google provides a plugin for Eclipse that makes development with Google Web Toolkit even easier. Download Eclipse

Set up Eclipse - Google Web Toolkit - Google Code

http://code.google.com/webtoolkit/usingeclipse.html