KompoZer

http://kompozer.net/

Easy Web Authoring!

KompoZer is a complete web authoring system that combines web file management and easy-to-use WYSIWYG web page editing.

KompoZer is designed to be extremely easy to use, making it ideal for non-technical computer users who want to create an attractive, professional-looking web site without needing to know HTML or web coding.

Aptana Studio 3

http://aptana.com/products/studio3/download

The professional, open source development tool for the open web

It's ready. It's time. Develop and test your entire web application using a single environment. With support for the latest browser technology specs such as HTML5, CSS3, JavaScript, Ruby, Rails, PHP and Python. We've got you covered!