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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.

Highlights include the following features:

• Code Assist on JavaScript, HTML, and CSS languages, including your own JavaScript functions
• Outliner that gives a snapshot view of your JavaScript, HTML, and CSS code structure
• FTP/SFTP uploading, downloading and synchronization
• JavaScript debugger to troubleshoot your code
• Error and warning notification for your code
• Support for Aptana UI customization and extensions
• Cross-platform support
• Free and open source licensed under the Eclipse Public License, v1.0.