On the left are sites by category. 

Below are Featured sites.

Beyond Open Water Blog

Better Diving- Ed Gabe (PADI and GUE instructor)

New Horizons Dive Center- Lexington, KY- PADI 5 Star Instructor Development Center

SUDSDiving.Org Soldiers Undertaing Disabled Scuba

Sterling Silver Scuba – Sterling, VA-PADI 5 Star Instructor Development Center

Tech Dive New Zealand Technical diving training provider based in Auckland