Now, this is a cool site.  http://bridgingapps.org/

Bridging Apps:

Our mission is to bridge the gap between technology and people with disabilities.

This is the introduction to their website:

We believe that it is more important to focus on the person who will be using the technology, rather than the device itself. We assume that you are here because you want to improve a skill or creatively compensate for a deficit that may be preventing a person with a disability from maximizing their highest potential.