The other day I found that list of WYSIWYG Editors [1]. The one that attracted me quite a lot was Epoz [2]. A demo is available online [3].
[1] http://www.bris.ac.uk/is/projects/cms/ttw/ttw.html
[2] http://mjablonski.zope.de/Epoz
[3] http://www.zfl.uni-bielefeld.de/personal/mjablonski/epoz (Demo)
