CSE HTML Validator Lite
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Full user review
"I use it as a viewer, it integrates with Firefox, free!"
I don't do a lot of HTML editing, and what I do is usually simple changes using Notepad. But for a clear presentation of what is going on in an HTML file, CSE HTML Validator Lite is hard to beat. At the price, impossible! I like that it can integrate with Firefox. I especially like the polite and flexible way it handles files that are changed by another application while it has them open.
It loses 1/2 star because it doesn't integrate with Firefox on a computer that is permanently offline. At least, not that I can figure out -- which for me is the same thing. Other than that, what's not to like?
Outstanding for viewing HTML files, and free to boot. I have not used it as an editor, so I don't have an opinion on that. For my use, primarily to clearly understand the HTML behind a file my browser is viewing, it is remarkably good.