Aptana: The Web IDE This open-source project has released a beta of their new Aptana IDE, simultaneously for Windows, Mac OS X, and Linux. The website has loads of information available, including some well done screencasts. Aptana comes out of the box with support and examples for doing projects with Dojo, Mochikit, and Yahoo YUI. It's also available as a plugin for Eclipse. Pretty impressive from what I've seen so far!