My friend Zee runs a project that is focused on connecting makers to people with disabilities to create open-source assistive technologies. They are putting plans online so anyone can 3D print their own AT devices! One of their flagship devices is an inexpensive, open-source, mouth controlled input device to operate a touchscreen device. Check out their website with many open-source designs: http://www.makersmakingchange.com/.
Are you a maker that wants to help people with disabilities? Sign up at http://www.makersmakingchange.com/, connect, and build useful stuff!