National Organization of Mothers of Twins Clubs (NOMTC)
This non-profit organization was founded in 1960 for the specific purpose of promoting the special aspects of child development for multiple birth children. They have tons of information pertaining to multiple birth, parenting, as well as research and conventions.
The International Twins Association
This association was organized by and for twins in 1934. They state that they are a non-profit, family-oriented organization to promote the spiritual, intellectual, and social welfare of twins and multiples throughout the world.
Having Twins Now
A site documenting the experiences, fears, decisions and process of having twins.
Mother of twins A site dedicated to parents of twins from twin pregnancy to beyond.
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