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W3C-PHP
W3C-PHP is a little php-cli script that can validate a list of URLs trough the W3C validator Web site....
W3C::LogValidator::Basic
W3C::LogValidator::Basic is a W3C log validator. It can sort web server log entries by popularity (hits)....
Bundle::W3C::Validator
Bundle::W3C::Validator is a Perl bundle of modules required by the W3C Markup Validator....
W3C (X)HTML Validation
W3C Markup Validation Service...
WikkaWiki
A flexible, standards-compliant and lightweight wiki engine written in PHP...