FCKeditor

This HTML text editor brings to the web many of the powerful functionalities of known desktop editors like Word. It's really lightweight and doesn't require any kind of installation on the client computer. As it is Open Source, you are allowed to use it for free wherever you want.

The best online xhtml editor available if you ask for my appinion.
And will be the editor used for the CMS iam working on.

Future planned developments:

• Advanced support for accessibility issues.
• Review all dialog boxes and make then as much complete as they can be
• Flash Support.
• Multimedia files support.
• Complete documentation.

Iam looking forward to the flash and multimedia support.

Link: http://www.fckeditor.net/