CSE HTML Validator Lite 

CSE HTML Validator Lite is a fast, easy to use, and free HTML development tool for Microsoft Windows that helps create syntactically correct HTML and XHTML documents.
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CSE HTML Validator Professional 

CSE HTML Validator Professional is a fast, powerful, user configurable, and easy to use professional web development tool that helps you create syntactically correct and accessible HTML, XHTML, and CSS. Fixes HTML. Also checks links.
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Amiasoft SiteAid 

Amiasoft SiteAid offers full HTML 4.0 Transitional support, feature rich Style Sheet support, an HTML validator, JavaScript tools, FTP support, colored syntax, spell check, advanced find/replace, full HTML and Style Sheet Help Files and much more.
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