- Australian Little America's Cup Challenge
 - Building a C-Class catamaran to challenge for the Little America's Cup. - Cat44 Catamaran Sailing Club of Fort Lauderdale
- Catering to beach catamaran sailors and Hobie Cat enthusiasts in South Florida.
- Catamaran Racing Association of Michigan
- Nonprofit organisation promoting catamaran racing on the Great Lakes.
- Catamaran Sailor
- Catamaran and multihull sailing magazine with nautical books, discussion groups, polling booth, and more.
- Florida Offshore Multihull Association
- Includes meeting information, a newsletter, upcoming events, and photos.
- Gemini Gems
- Online community for owners of Gemini Catamarans.
- Hobie (6)
- Northwest Multihull Association
- Club for sailors, builders, racers, and dreamers of multihull sailing craft.
- Off The Beach Catamaran Construction
- Pictorial record of tortured ply, chined, and cedar strip construction methods.
- Palm Beach Sailing Club
- Races as Pittwater Catamaran Club. Site includes committee details, photos, boat duty roster, membership info, and more.
- San Francisco Bay Area Multihull Association
- For local builders, cruisers, racers, daysailors of multi-hulled sailboats.
- Team Adventure
- Official site for the 110 foot, state of the art catamaran.
- Triamran Kaskelot
- Speedsailing trimaran located in the Geltinger Bucht.
- Trikini Project
- Offers multihull and design and building data.
- UK Dart 15 Association
- Includes information on clubs, racing, events, advice, and membership.
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