worked really well when I tested it under Tikiwiki 1.8.2. It can replace every TEXTAREA object, everywhere on the site, with a WYSIWYG editor, that worked fine under Mozilla 1.6, Firefox 0.8 and IE 6, by just adding a few lines to header.tpl. It is licenced under LGPL.
The cross-browser rich-text editor implements the new Midas API included with Mozilla 1.3+. Requires: IE5.5+/Mozilla 1.3+ for all rich-text features to function properly. If browser does not support rich-text, it should display a standard textarea box.
To be listed below the editor must be TTW ("through the Web" - it works within a browser) and WYSIWYG ("what you see is what you get" - you don't see HTML). Some editors allow you to toggle between "view" and "source" modes - this is a bonus but not a prerequisite for this list.
Bitflux Editor is a browser based Wysiwyg XML Editor – and that changes everything! You can edit now your content semantically and at the same time display it to your users and editors in its final form.
Ekit is a free open source Java HTML editor applet and application. The Ekit standalone also allows for HTML to be loaded and saved, as well as serialized and saved as an RTF. It is approaching its first production release version.