W3C - Web Accessibility Initiative (WAI) pursues accessibility of the Web through technology, guidelines, tools, education and outreach, research and development.

RNIB - designing accessible websites. RNIB is UK’s leading charity offering information, support and advice to over two million people with sight problems.

AbilityNet - help and advice on training and assistive technology for people with disabilities.

WebAIM - Web Accessibility in Mind - Expanding the Web's potential for people with disabilities.