SciTE is a source code editing program for Windows and Linux. I wouldn't recommend using it for web editing, but if you need to make quick changes to your HTML, this program will do the job. It is a text editor based on SCIntilla and was originally used to demonstrate SCIntilla.
Score: 72 / 23%
WML is very complicated. It bills itself as a product for web developers who prefer to program and it does a lot more than just edit the web pages for you. It works with all the files in your site to generate the HTML rather than build them. The website has not been updated since 2006, so this program may no longer be supported.
Score: 67 / 22%
EditLive! is WYSIWYG HTML editor that companies can use to embed in web applications such as content management systems (CMS). It offers the ability to edit both in WYSIWYG mode and in HTML mode. One of the things I liked was that it has a built-in accessibility analyzer. This makes it easy to write accessible pages. I couldn't find an HTML validator. This is a great tool for web designers who include a CMS or wiki in their deliveries as then clients can maintain the pages themselves after they are built.
Score: 49 / 16%
XMLPro is a validating XML editor. It is not easy to use as an HTML editor, but it is possible. It is free to individuals, educational institutions and not-for-profits. But licensing options are available for business use. This is a GUI XML editor.
Score: 46 / 15%