OpenWolf is a web accessibility guidelines validator. By default, it checks websites against the WAI checkpoints. It supports CSS and poorly written HTML, and It is easily customised for any particular requirements.
wuhkag is a Web application written in PHP for evaluating Web sites accessibility and publishing an HTML accessibility policy. It supports W3C WCAG 1.0 and requires PHP 4; future developments include XML and EARL output support, with XSL i18 policies