Here are 3 of the more popular software programs that can be used to help ensure that a web site meets the standards for accessibility. It is important to note that these automated programs can be extremely useful in quickly identifying a wide range--but not all--of the barriers to accessibility. Like virtually any set of complex decision rules applied automatically, they can result in false positives and false negatives.
A-Prompt Web Accessibility Verifier
A-Prompt (which stands for Accessibility Prompt) is "a software tool designed to improve the usability of HTML documents by evaluating Web pages for accessibility barriers and then providing developers with a fast and easy way to make the necessary repairs." A-Prompt's software reflects the accessibility guidelines developed by the Web Access Initiative (WAI) of the World Wide Web Consortium.(W3C). It is a joint effort of the University of Toronto's Adaptive Technology Resource Centre and the University of Wisconsin's Trace Research & Development Center.
RAMP is a software program developed by Deque Systems that provides "analysis and remediation of Section 508 rules and W3C WAI Web Content Accessibility Guidelines, providing efficiencies of over 95% as compared to a manual effort. In addition, RAMP™, written in Java for platform independence, is also accessible to people with disabilities."
"Total Validator is a free one-stop all-in-one validator comprising a HTML validator, an accessibility validator, a spelling validator, a broken links validator, and the ability to take screenshots with different browsers to see what your web pages really look like."
Please follow this link to 7 Easy Steps Toward Web Site Accessibility