Related to Autism Spectrum Disorder: 

Association for Behavior Analysts International

Autism Research Institute

Autism Speaks

Autism Society of America

Behavior Analyst Certification Board

Cambridge Center for Behavioral Studies

Individuals with Disabilities Education Act (IDEA)

First Signs

Law and Advocacy

National Autism Center

National Dissemination Center for Children with Disabilities

National Institutes of Health

National Center for Complimentary and Alternative Medicine                                               See My IEP

The Friend Tree: CAST 

Related to Mindfulness-Based Intervention: 

Mindful Schools 

Center for Mindfulness, University of Massachussets

UCLA Mindful Awareness Research Center

Harvard Gazzette

Mindful Magazine 

Center for Investigating Healthy Minds