Wave Accessibility Evaluator (WAI Beta) - WAVE complete (includes WCAG 1.0, Section 508) checking - http://www.wave.webaim.org/index.jsp
A-prompt Accessibility Checker - http://www.websavvy-access.org/resources/aprompt.shtml
Cynthia Says - reports WCAG Level 1 & 2 errors and provides an alt text quality report http://www.icdri.org/test_your_site_now.htm
Dottie - to automate the process of checking a Web page for compliance with many of the NIA\NLM (http://www.nia.nih.gov ) guidelines for Web accessibility for older adults http://www.cba.nau.edu/becker-a/Accessibility/Dottie/Dottie.html
Monitor Central - finding and fixing Section 508 Problems WC3 standards compliance http://www.brownsite.net/moncen.htm
Vischeck - simulates color blindness –
http://www.vischeck.com
