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Windows. Based on an SGML parser. Shareware.
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Windows. HTML, XHTML, and CSS validator. Also checks accessibility, links, and spelling. Commercial pro version and free lite version.
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Perl script which corrects incompatible HTML generated by Microsoft applications.
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A W3C Tidy-based HTML Validator which checks pages from within the Firefox web browser.
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Optimize HTML documents, resulting in shorter downloading and uploading time. Pages will appear in client's Internet browser in the same way, but they will be about 20-40% smaller. Software features, screenshots, download, Flash tutorial, and PDF manual.
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Windows. Includes validator, image scanner, meta tag manager, find and replace tool, tag pair fixer, and an HTML to text converter. Commercial software; 30-day demo.
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Windows. Removes unnecessary characters from HTML, CSS, Perl, JavaScript and many other web file formats. Commercial pro version and free light version.
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Unix, Windows, MacOS, and others. Validator fixes errors in HTML and XHTML. Converts HTML to XHTML. Free Software.
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Unix and Windows. Lint and link checker. Commercial software; free trial. Also online checking.
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Windows and Unix. Object-oriented toolkit for SGML parsing and entity management. Can validate any version of HTML for which a DTD is available. Free Software.
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Windows. Instructions for the Do-it-yourself Offline HTML Validator using SP.
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Unix. Generates statistics and finds inconistencies in a subweb (web site).
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Linux, Mac OS X, and Windows. Finds broken links, non-standard HTML, and links between URIs on web sites. Commercial software; free for small sites.