- Cerebrals Society
- Features membership information, member forums, articles, and an online newsletter.
- Genius Society
- International organization aims to bring together members with 99.9th percentile in intelligence.
- HighPotentialsSociety
- Aims to provide a forum for intellectually highly talented people. Qualification measured by intelligence quotient (IQ).
- Intellect-Fellowship.org
- Features news, forums, and exclusive member content.
- International High IQ Society
- Offers free online IQ tests, membership information, and an online magazine.
- Intertel
- Provides information on the organization and membership.
- Pars Society
- Group of high intelligence individuals. Aims to provide a private, intellectual, and peaceful cyberspace for its members.
- Poetic Genius Society
- Organization of intellectually gifted individuals with passion for poetry.
- Prometheus Society
- Includes membership information, news, links, and articles.
- Triple Nine Society
- Organization for individuals who rate at least 99.9% in adult intelligence tests.
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