Blue Diving Center: Cayo Coco. Panamanian company offers certification courses and dive trips. Describes equipment, boats, and staff. [Italian/English/German/Spanish]
Oceanus: Dive live-aboards to Cuba, Chinchorro Banks and Alacranes Reef.
Scuba Diving Free: Based in Havana. Information on introductory, scuba, and free diving courses, with biography of instructor Jorge Mario Garcia Fernández. [English/Spanish]
Scuba2: Information on diving in Cuba, including rates, accommodations, and dive site photos. Canadian based company.