1) Aptana Studio 3
Aptana Studio 3 is an open source web development tool. Has support for the latest browser technology specs such as HTML5, CSS3, JavaScript, Ruby, Rails, PHP and Python.
Core Features of Aptana Studio 3
- HTML, CSS, and JavaScript Code Assist
- GIT Integration
- Integrated Debugger
- Built-in command line terminal for execution of operating system commands and language utilities
2) Aloha Editor — Learn More About Aloha Editor
3) Rendara — Makes learning HTML5 and CSS3 easy! Web Developers can try out some Javascript and experiment with jQuery, jQuery Tools and jQuery UI libraries. Try Rendara
4) BlueGriffon is a new WYSIWYG HTML5 editor. Powered by Gecko, the rendering engine of Firefox 4, BlueGriffon is a modern and robust solution to edit Web pages in conformance to the latest Web Standards. Because Gecko lives inside BlueGriffon, the document you edit will look exactly the same in Firefox 4. It’s free to download and is available on Windows, Mac OS X and Linux.
5) Mercury is a full featured HTML5 editor. Supports all browsers that have implemented the complete W3C contentEditable specification i.e., Firefox 4+, Chrome 10+, Safari 5+. Learn More about Mercury Editor