KompoZer is a full completed web developing system that provides web file management and easy-to-use WYSIWYG web page editor.

KompoZer is designed to be most 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.

KompoZer is based on Gecko, the layout engine in Mozilla; it's a fast, very reliable, standards conformant engine maintained on a daily basis by a large community of developers. Its remarkable support of XML, CSS and JavaScript offers the best authoring platform on the market. Architecture of Kompozer based on XUL makes it the most extensible editing tool ever.

Some features:
# Secure HTML code creation that will work with all of today's most popular browsers.
# Switch between WYSIWYG Editing Mode and HTML using tabs.
# Tabbed editing to make working on multiple pages a snap.
# Powerful support for forms, tables, and templates.

Link to the official website: http://kompozer.net/