access-board.gov - The U.S. Access Board is a federal agency that promotes equality for people with disabilities through leadership in accessible design.
w3.org/standards/webdesign/accessibility - It is essential that the Web be accessible in order to provide equal access and equal opportunity to people with diverse abilities. Indeed, the UN Convention on the Rights of Persons with Disabilities recognizes access to information and communications technologies, including the Web, as a basic human right.
https://www.w3.org/TR/WCAG20/ - The WCAG 2.0 conformance standards
daisy.org - The DAISY Consortium is a global partnership of organizations committed to creating the best way to read and publish, for everyone.