Aptana Studio is the leading IDE for Web application development, including JavaScript, HTML, and CSS. Aptana Studio is cross-platform, free, and open-source. HTML, CSS, and JavaScript Code Assist Complete HTML DOM 0, 1 and 2 support for HTML, CSS and JavaScript code assist. CSS code assist provides both suggestions and hints. HTML code assist includes all HTML elements and properties. Aptana Studio comes packaged with popular Ajax libraries which are core to so many Web development projects today. jQuery, prototype, scriptaculous, Ext JS, dojo, Spry, and YUI come bundled right in. More, like MochiKit and MooTools are available as separate plug-ins. For each you get code assist, importable sample projects, and doc links at your fingertips. JavaScript Debugging, DOM Outline View, FTP, Cloud, SFTP, FTPS, Database Tools.