http://info.cern.ch/hypertext/WWW/Tools/tkHTML.html
I built them on OSF1V2.0 against X1R5 and X11R6. All
worked just fine.
This tkHTML editor has a previewer to peek at "WYSIWYG"
It is not completely "WYSIWYG".
Also, if your religion is emacs, there is "html-helper-mode.el"
without a preview.
--
... Ibrahim