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W3C Markup Validator
The W3C Markup Validation Service is a free service that checks web documents in formats like HTML, XHTML, SMIL, MathML etc. for conformance to W3C recommendations and other standards. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets or to find broken links, there are other validators and tools available. You can validate by URL, by file upload and by direct input.
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Tidy HTML Validator
HTML Tidy is not just a HTML validator for your web documents. It is able to correct (repair and fix) bad HTML code and give you pointers to areas where you need to change in order to make your web page accessible to people with disabilities. Source code and binaries are available for a wide variety of operating systems, including Windows 95/98/NT/2000, Mac OS, Atari, Amiga, BeOS, AIX, Linux, UnixWare, MSDOS, Solaris, FreeBSD, RISC OS, etc. There is even a Java port of HTML Tidy.
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Web Page Purifier
The Web Page Purifier allows you to check your HTML pages for compliance ('purity') with various HTML standards (eg HTML 4.0 Transitional, HTML 4.0 Strict, WebTV 1.1, HTML 3.2, etc). There's a form where you can enter the URL of the page to check, or you can also download the Perl CGI source code.
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