BlueGriffon is a WYSIWYG content editor for the World Wide Web. It is based on the discontinued Nvu editor, which in turn is based on the Composer component of the Mozilla Application Suite.
CSSEdit is primarily focused on CSS editing and is ideal for web designers who prefer a Mac-only tool, while BlueGriffon offers a more versatile WYSIWYG editor suitable for beginners and cross-platform use.