One of the things I like best about the long abandoned KompoZer website editor is it's "Remove All Text Styles" feature. This is a handy tool for getting rid of the noise in old websites (such as font tags, colors and the like) and restoring pages to just basic HTML of text and links. I haven't found another web editor that does this. I bet it do well as standalone app, I'd buy it!
http://kompozer.net/index.php
Remove All Text Styles keyboard commands:
Command + O (to open file)
Command + A (to select all)
Command + Shift + Y (to Remove All Text Styles)
Command + S (to save)