The «Accessibility Developer Guide» is an initiative of «Access for all», Swiss Foundation for technology adapted to people with disabilities. It is developed and maintained in collaboration with a number of acclaimed web agencies. The vision behind the Accessibility Developer Guide is to bridge the gap between providers of websites and users with special needs.
The ADG is set up as an Open Source Project on https://github.com/Access4all/adg . Regular "Hackdays" are organized to connect developers, designers and others caring about accessibility to push the project forward.