Fangs--A Mozilla Firefox plug-in, Fangs will render a web page in a way similar to how a screen reader will read it.
Raising the Floor (RtF) is an international coalition of individuals and organizations working to ensure that the Internet, and everything available through it, is accessible to people experiencing accessibility barriers due to disability, literacy, or age.
WAVE--Helps you check if your page is accessible to people with disabilities.
World Wide Web Consortium (W3C) --The W3C is the international standards-setting organization for the World Wide Web. As such, it has issued comprehensive standards that ensure an accessible web presence known as the Web Content Accessibility Guidelines (WCAG).