http://www.autism.com/
Autism Research Institute is a non-profit organization established in 1967 to conduct research and disseminate the results of research on the triggers of autism and on methods of diagnosing and treating autism.
http://www.autismspeaks.org/
Autism Speaks tries to change the future for all who struggle with autism spectrum disorders. They are dedicated to funding global biomedical research into the causes, prevention, treatments, and cure for autism; to raising public awareness about autism and its effects on individuals, families, and society; and to bringing hope to all who deal with the hardships of this disorder.