.
The W3C are the independent standards organisation for the web. W3C standards are observed by web browser developers, so sites that conform to standards are accessible to more web users.
Bobby is an accessibility checking program. Although automated checkers have their limits, Bobby is a useful tool that allows us to identify potential problems for people who are blind, partially sighted, or have other special needs.
ICRA - the Internet Content Rating Association. Using an ICRA label provides for objective labelling of content and assists in filtering.