1Design.Net: Florida catamaran sailing, includes discussion forum, photos, videos, club links, schedule, classifieds, and one design fleets
Beachcats: UK site covers the European catamaran race news, has reviews, photography, and discussion of boat designs.
Cat-alist: Portal for catamaran sailing enthusiasts from maxis to beach cats to racing to cruising: headlines on beach catamaran events, issues, notices, news, classifieds.
Dragonfly Trimarans User Forum: International (independent) user forum for Dragonfly 800, 920, 1000 and 1200 Trimarans. Including information exchange on all aspects of Dragonfly Trimarans plus news and dates and For Sale/Wanted page.
Florida Multihull Sailor: News of multihull regattas in Florida, contains race schedules, reviews, and photography.
Multihull Maven: Profiles all boat models, brands, designers, yards, and associations. News and feature articles and used boat search.
Multihulls.com: Resource for current and future multihull owners and sailors, with information about boat shows, sales, charters, publications, and news.
Outrigger Sailing Canoes: Covers all types of outrigger sailing conoes and proas known as flying or Micronesian proas. Includes history and specifications of proas from 16 to 52 feet.
Proafile: Articles on the sailing, design, development, building, racing, and history of proas.
ProaSail: Proa sailboat instruction, plans, and demonstrations. Includes drawings and construction photos.
Sail 4 Speed: Site of a one off trimaran for racing against itself. They try to optimize the multihull to reach speeds above 30 knots.
Supernova fan: Supernova trimaran construction details plus links and a discussion forum.
The Kalia Foundation: Non-profit organization developed to preserve and extend the Polynesian Seafaring tradition.
TheBeachcats.com: Offers sailing pictures, repair tips, news, free classified ads, and a mailing list.
Themultihulls.com: Find forums, symposiums, meeting schedules, and news relating to catamarans and trimarans.
UK Catamaran Racing Association: Portal site with links to all United Kingdom catamaran class associations, includes mailing list, forums, directory, calendar, and classified ads.
Worrell 1000: The Worrell 1000 catamaran race from Virginia Beach to Florida.
Yahoo! Groups : Beachcats: Mailing list devoted to discussion of sailing small catamaran sailboats known as Beachcats. Site offers chat, file storage, web links, photo albums, and message archive.