KompoZer is a wysiwyg HTML editor using the Mozilla Composer codebase. As Nvu's development has been stopped in 2005, KompoZer fixes many bugs and adds a few useful features.
Unimpressed. I needed to take a section of HTML and indent it all one level. There seems to be a feature for that, but it turns out it only operates in the "Normal" (WYSIWYG) mode, so what it is indenting is what the person viewing the pages sees. The function won't work on the HTML code. How very, very lame. Additionally, this is one of those products that wants to change the underlying HTML (and I have the "Retain original source formatting" option selected). It inserts line breaks where I did not have them and does not seem to handle the ASP characters correctly even after trying to set the options accordingly.