Sampling of non-profits that help the disabled:

Disability Rights Education and Defense Fund
Special Needs Alliance
National Disability Rights Network
Disabled American Veterans
Paralyzed Veterans of America
Blinded Veterans Association
Easter Seals
Muscular Dystrophy Association
The Arc
4 Paws for Ability
Special Olympics
National Alliance on Mental Illness
United Cerebral Palsy
Reeve Foundation
Autism Spectrum Disorder Foundation
Parent to Parent USA