TinyMCE is the fantastic WYSIWYG freeware tool, it is a great advantage to the Content Management System. Easily integrate with the .Net application with the bunch of javascripts.
It allows us to edit the Web page content on the fly. It works on a very simple concept, i.e. We are supposed to edit the web page content inside the TextArea, If we have server side TextBox control we can make it Multiline to be rendered as a TextArea on the browser.
TinyMCE automatically integrate its toolbar with the TextArea control, to provide advance editing option, We can also customize the toolbar according to our requirement.
I reccomend to use this tool for Content Management, and highly grateful to the entire TinyMCE (Moxiecode) team to have such a nice vision.
TinyMCE Forum