TinyMCE very fast,easy to use and open source, thanks TinyMCE for the best editor.
About TinyMCE
Version: 3.3.3 (2010-04-19)
TinyMCE is a platform independent web based Javascript HTML WYSIWYG editor control released as Open Source under LGPL by Moxiecode Systems AB. It has the ability to convert HTML TEXTAREA fields or other HTML elements to editor instances.
Copyright © 2003-2008, Moxiecode Systems AB, All rights reserved.
For more information about this software visit the TinyMCE website.