RNIB - Royal National Institute for the Blind
British Dyslexia Association - Good information about how people with dyslexia process information and use the internet.
RNID - Royal National Institute for the Deaf
GAWDS - Guild of Accessible Web Designers
Ability Net - A leading authority on accessibility. Provides training and equipment to people with disabilities and consultancy services to businesses.
UAWG - The Usability and Accessibility Working Group has been established to create an accreditation scheme to identify qualified designers. The site also has information on accessibility and usability.
Web Standards Project - Trying to develop standards for web design, browsers, plug-ins and extensions to make surfing the internet easier for everyone.
Accessify - A very good informative site about making your website accessible. Full of news articles and reports.
UseIt - A leading authority on Usability issues.
The Plain English Campaign - Working towards improving readability, they can offer help in making your documents readable.
A List Apart - Online magazine about web design and web standards compliance.
How People With Disabilities Use the Web - The World Wide Web Consortium offers examples of how people with different disabilities access the internet and problems they encounter.
WebAIM - News, information and tips about accessibility.
WebXact - Formerly Bobby, an automated web accessibility checker.
Wave - Web Accessibility Versatile Evaluator. An automated testing tool brought to you by WebAIM.
Cynthia Says - An automated accessibility testing tool.
Color Vision - Look at different colour combinations of backgrounds and text to find the right contrasts.
Vischeck - Test how your site looks to users with different types of colourblindness.
Plain Language Audit Tool - Assess how readable your site is.
Fangs - A Firefox/Mozilla extension which allows you to linearize your pages.
Accessibar for Mozilla/Firefox - Toolbar which allows you to manipulate the settings of any webpage in your browser.
Web Accessibility Toolbar for IE - A useful toolbar for checking various accessibility issues such as CSS, alt texts and colour contrasts by changing the settings on your browser.
Web Developer Toolbar - A toolbar for Firefox/Mozilla that lets you check your pages for missing alt text, turn CSS, images and scripts off and on, validate your pages, etc.
Web Content Accessibility Guidelines 1.0 - This is the current standard for accessibility on the internet developed by the Web Accessibility Initiative of the W3C. While version 2.0 is in development and should clear up some confusion, 1.0 is the basis for most legislation around the world.
Disability Discrimination Act (UK) - The UK legislation making accessibility a legal requirement.
Section 508 - The U.S. legislation making accessibility a legal requirement for all government websites, sites receiving government funding and sites doing any sort of business with a United States government organization.