RightWebPage Pro is a web development tool that verifies many aspects of conformance of web sites to international standards of web engineering best practices. The conformance reports are outlined by ISO 23026:2006 standard and, according to that standard, web sites are tested for CSS, HTML and accessibility compliance. It is also a quality assurance tool that allows recording and playback of functional test cases.
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