HTML Through-the-web Editors (multi-browser)
Here is a list of HTML Through-the-web editors that work on IE5+ and Mozilla 1.3+. The following are either free or open-source, have cross-browser support and wherever possible I’ve linked them directly to their demo pages.
FCKEditor
Cross Browser Rich Text Editor
Kupu Editor
TinyMCE (Small, quick, featured)
TypeTool
XStandard Lite
CMSimple
By Mikhail Esteves | November 17th, 2004 in
Software


Wow! TinyMCE is so very cool. I just recommended for people to look on WP forum here.
XStandard is the only one on the list that generates standards compliant markup.