KompoZer is an open source wysiwyg HTML editor. KompoZer is aimed for Advanced users. At present KompoZer 0.7.9 version is available.
KompoZer supports Windows 2000/2003/2008/9x/Vista/XP. KompoZer for Mac OS X, KompoZer for Linux editions are also available. Source code to work with many OS platforms is also available for KompoZer.
You can get KompoZer for windows and also platform independent KompoZer version at the following location.