PADI, the Professional Association Of Diving Instructors, the largest certification body of diving.
SSI, scuba schools international has been serving divers since 1970, and continues to be one of the fastest growing training agencies in the industry.
NAUI, National Association of Underwater Instructors, a not-for-profit 501 (c) (6) worldwide educational association incorporated under the laws of the State of California, United States of America.
BSAC, British Sub-Aquatic Club,one of the most respected diving organisations in the world with a reputation for the excellence of its diver training programme. Formed to promote underwater sport, exploration, science and safety to the highest standards
TDI ASIA, Technical Diving Institute, deals largely with enriched air diving (nitrox), and is your first step towards being a commercial diver.
EquipMents... Check out these manufacturer's sites
Misc.. Dive Centres, tours, blah blah blah...
AsianDiver OnLine, website of the fantastic diving production, check it out for the latest news on diving in the region.
Global Scuba Network, the name says it all.
Scuba Duba, the actual website is much better than the name sounds, contains lots of information on diving in general.
Dive Asia, the largest dive centre in Phuket and maybe asia, a site not to be missed for information about diving in the region and continuing education.
Scuba Corner, a local dive centre's website.
InnerSpace Dive Centre, another local dive centre.
Scuba Diving in Singapore, information and links about diving in Singapore, reviews on local dive sites (and reasons why you shouldn't visit them... ).
Friendly Waters, the NTU scuba diving club's official dive operator. Feel free to approach them directly for courses and equipment.