See also:

• Computers: Data Formats: Markup Languages: HTML: Tools: Validators and Lints  (22)
• Computers: Data Formats: Markup Languages: XML: Validation  (57)
• Computers: Software: Internet: Site Management: Link Management  (28)

• CSE HTML Validator - Windows. HTML, XHTML, and CSS validator. Also checks accessibility, links, and spelling. Commercial pro version and free lite version.
• Demoroniser - Perl script which corrects incompatible HTML generated by Microsoft applications.
• Firefox extension HTML Validator - A W3C Tidy-based HTML Validator which checks pages from within the Firefox web browser.
• HTML Code Cleaner/Compressor - Windows. Optimizes HTML documents removing unnecessary HTML code while checking links. Commercial software with free trial.
• HTML PowerTools - 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.
• HTML Shrinker - Windows. Removes unnecessary characters from HTML, CSS, Perl, JavaScript and many other web file formats. Commercial pro version and free light version.
• HTML Tidy - Unix, Windows, MacOS, and others. Validator fixes errors in HTML and XHTML. Converts HTML to XHTML. Free Software.
• LinkScan/QuickCheck - Unix and Windows. Lint and link checker. Commercial software; free trial. Also online checking.
• A Real Validator - Windows. Based on an SGML parser. Shareware.
• SP - 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.
• SP Instructions - Windows. Instructions for the Do-it-yourself Offline HTML Validator using SP.
• SWAN: SubWeb Analyzer - Unix. Generates statistics and finds inconistencies in a subweb (web site).
• WebLight - 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.