NoteTab is a TextEditor/HyperTextMarkupLanguage editor. While the commercial features are a bit useless to hand-coders (such as me), there is a freeware version available. It handles well, but the extra stuffing is a bit too weighty for what it is. On the other hand, some of the included "clip libraries" make some HTML formatting easy. Highlight the text, hit ...
enclosing the list items.
1.8 million byte download, MicrosoftWindows only
It allows you to filter highlighted text (or the whole file) through Perl programs, so you can write your own tools if you like. Demoronizer, anyone? Also works well with Dave Raggett's HtmlTidy program.
Also supports "outline" (docname.otl) documents. These documents can only be created in the licensed version, but can be browsed using the free version.