- TwinStuff.com
 Bulletin boards, twin games, photo gallery, information for parents, TV and movie twins, twin events, and information.
- Twinsworld
 Offerings include a twin casting agency, twin events, reunion of twins placed for adoption or separated at birth, message boards, links, photos, contests, and research.
- Facts About Multiples
Information on twins, triplets, quadruplets, quints and higher order multiples. Features a database of multiple birth families, statistics, basic information on twinning and a message board.
- Multiple Births Canada
MBC's mission is to improve the quality of life for multiple birth individuals and their families across Canada and provides support, education, research, and advocacy to individuals, families, and organizations with a personal or professional interest in multiple birth issues.
- The Center for Study of Multiple Birth
A resource for research and information about the causes, effects and problems of multifetal pregnancy.
- The International Twins Association
A non-profit, family-oriented organization to promote the spiritual, intellectual, and social welfare of twins and multiples throughout the world.
- TwinMajority.org
From 2127, most babies will be twins. This site explains why evolution predicts this.
- Twins by Twins
This site is built for all those that want to learn more about twins and is dedicated to those that are twins and proud of it.
- Twins Life Magazine
An online magazine for twins and parents of twins.
- Twins Network
A resource for understanding twins and sharing information. Surveys, facts, news, trivia, links.
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