HTML Tidy - Unix, Windows, MacOS, and others. Validator fixes errors in HTML and XHTML. Converts HTML to XHTML. Free Software.
A Real Validator - Windows. Based on an SGML parser. Shareware.
LinkScan/QuickCheck - Unix and Windows. Lint and link checker. Commercial software; free trial. Also online checking.
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.
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.
Demoroniser - Perl script which corrects incompatible HTML generated by Microsoft applications.
HTML Shrinker - Windows. Removes unnecessary characters from HTML, CSS, Perl, JavaScript and many other web file formats. Commercial pro version and free light version.
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).
HTML Code Cleaner/Compressor - Windows. Optimizes HTML documents removing unnecessary HTML code while checking links. Commercial software with free trial.
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.
Firefox extension HTML Validator - A W3C Tidy-based HTML Validator which checks pages from within the Firefox web browser.
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