Starting with Eclipse 3.4 (called “Ganymede”) an advanced editing support for JavaScript has been included. On top of this native JavaScript support, the project QXDT aims at providing qooxdoo-specific support.

More tips for Developing with Eclipse.

Spket IDE is a powerful toolkit for JavaScript development. Its editor provides features like code completion, syntax highlighting and content outline that helps developers productively create efficient code. It comes with specific support for qooxdoo.

Please note: there is a hotfix available for people working with the qooxdoo SVN checkout instead of the qooxdoo SDK. See the download link in the Spket forum. Thanks, Eric!

The Aptana IDE is a free, open-source, cross-platform, JavaScript-focused development environment for building Ajax applications. It features code assist on JavaScript, HTML, and CSS languages, FTP/SFTP support and a JavaScript debugger to troubleshoot your code. It is available for Windows, Mac OS, Linux and also as an Eclipse plugin.

There is some initial support for qooxdoo in the latest Aptana (nightly builds). The new class definition introduced in qooxdoo 0.7 is supported by an outline view that shows the typical sections like extend, statics, members, etc. For instance, you can easily navigate to any instance method just by selecting the corresponding entry in the outline view.

JSEclipse is a plugin for the Eclipse environment that helps developers code JavaScript faster and with no errors. With JSEclipse, you can complete a variety of tasks, from editing small sections of code to working with the next big AJAX library like qooxdoo or developing plug-ins for a product that embeds JavaScript snippets.

Download and install JSEclipse and improve your JavaScript coding experience with:

• Contextual code completion & shortcuts.
• Project outline and quick navigation through function declarations.
• Syntax highlighting.
• Error reporting.
• Customizable code templates to get you started.
• Support for popular JavaScript libraries (Dojo, Prototype, YUI, qooxdoo (currently for 0.5.x only)).
• Support for JavaDoc documentation and multi-line comments.

js2-mode offers improved JavaScript support in Emacs. While it doesn’t include qooxdoo-specific support, it eventually aims to be competitive with other best-of-class JavaScript editors. Also see the original blog post