TinyMCE

http://www.tinymce.com/

=Benefits=
 * Well known and used by a lot of CMS
 * Dropdown menu easy for EM : menubutton or menuitem : allow editing, but maybe time to update the system (just adding the {QCODE.NAOK}.
 * Already file upload integration GPL compliant
 * roxyfileman
 * elFinder

=constraint=