- Administration on Developmental Disabilities (ADD)
- Offers programs in partnership with state governments, local communities, and the private sector to assist people with developmental disabilities. - Civitan International Research Center
- Devoted to improving the well-being and the quality of life of individuals and families affected by mental retardation and developmental disabilities. - Developmental Disabilities Forum
 - Developmental Disabilities Leadership Forum
- Offering distance learning, discussions, conferences, and an online journal. - Developmental Disabilities Resource Center
- Provides services including early childhood, education, vocational, support services and residential services. - Learn the Signs. Act Early.
- Offers information, interactive tools, and resources about recognizing potential childhood developmental delays. Includes developmental milestone chart by age, fact sheets, and more. - Minnesota Governor's Council on Developmental Disabilities
 - Spare Time Activities For Mentally Disabled
- Aktionskreis Behinderte - AKB: mentally disabled and non-disabled members enjoy their spare time together. Site in German. - Specialneedsnurse.org
- Provides information, links, support, and active bulletin board on developmental disabilities for teachers, nurses, and parents.
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