Catalina Adventure Tours, Inc.
- Semi-submersible underwater and glass bottom boat excursions, walking and bus tours. Features company profile, news and media gallery, vessel specifications, seat sales, and merchandise.
- http://www.catalinaadventuretours.com/

Visit Catalina Island
- Visitors guide to the island. Includes reservation links, tours, webcams, image galleries, and information for Avalon and Two Harbors.
- http://www.visitcatalinaisland.com

eCatalina.com
- Includes calendar of events, shopping, dining, transportation and wedding resources.
- http://www.ecatalina.com/

CTC Destination and Meeting Management
- Group and individual hotel, tour, and transportation packages.
- http://www.ctc4u.com

Visiting Catalina
- Visitor information with a heavy emphasis on diving.
- http://www.visitingcatalina.com/

Catalina.com
- Visitor information includes activities, lodging, transportation, local history and wildlife.
- http://www.catalina.com/

Catalina Island Information Guide
- Visitor's information the Catalina Passenger Service. Lists over 300 activities and companies.
- http://www.catalinainfo.com/