Organizations

ADA Active Divers Association
ANDI American Nitrox Divers International
Cambrian Foundation Dedicated to Reasearch, Education, Preservation, and Exploration of the Aquatic Realm.
CDF Cave Diver's Forum
CDS Cave Diving Section of NSS
CEDAM Conservation, Education, Diving, Archeology & Museums International
Central Florida Shell Club, Orlando, FL.
CGA Compressed Gas Association
CMAS Confederation Mondiale des Activities Subaquatiques (World Underwater Federation)&
Conchologist's Information Network hosted by the Conchologists of America, Inc. (COA) - A very comprehensive site containing information about COA and all aspects of shells and shell-collecting. A must visit site, if you are interested in shells.
DAN Diver's Alert Network
DEMA Diving Equipment & Marketing Association
DRI Dive Rescue International
GUE Global Underwater Explorers
HDS Historical Diving Society 
HSAI Handicapped Scuba Association 
HUC Houston Underwater Club 
IANTD International Association of Nitrox & Technical Divers 
MSI Medical Seminars, Inc. 
NACD National Association for Cave Diving 
NASAR National Association for Search & Rescue 
NASDS National Association of Scuba Diving Schools 
NAUI The National Association of Underwater Instructors 
NOAA National Oceanic & Atmospheric Administration 
NTIS National Technical Information Service
ORD Orlando Reef Divers (Scuba Club) 
PADI Professional Association of Diving Instructors 
PSAI Professional Scuba Association International (formally PSA)
PDIC Professional Diving Instructors Corporation 
R.E.E.F. Reef Environmental Education Foundation
SAUU South Africa Underwater Union 
SDI Scuba Diving International 
Seaspace Scuba diving & adventure travel expo 
SPUMS South Pacific Underwater Medicine Society 
SR Self Rescue 
SSI Scuba Schools International 
STF The Star Thrower Foundation 
TDI Technical Diving International 
UHMS Undersea & Hyperbaric Medical Society
Undercurrent Dive & Site Reviews
WDHOF Women Divers Hall of Fame
WU Women Underwater
YMCA Scuba Young Men's Christian Association

Dive Manufacturers
Acou-stik Professional Underwater Scuba Communicator
Aqua Lung
Airdive Equipment Pty. Ltd.
Akona Adventure Gear
Apollo Sports
Bauer Compressors
Body Glove
Brownie's Third Lung
Cressi-Sub
Dacor
Diamond Diving web/dry suits
Discover Cool Submarine C-Questor  
Dive Rite
Divelink (u/w comm system)
Halcyon Rebreathers
Ikelite
Light & Motion Industries
Mares Diving Equipment
Night Sea
Ocean Ray Custom-fit Wetsuits
Oceanic USA
Pine Glen Jewelery
Pioneer Research SeaLife Cameras
Porta-Bote Folding Boat
Reef Scuba Accessories, Inc.
ScubaPro
Sea-lutions,Inc.
Sea Vision USA (masks)
Skin Diver Wetsuits UnderSea Video Housings
US Divers
UWATEC Worldwide
Zeagle