Hong Meigui Cave Exploration Society [more]
Offers expeditions in China and other countries. Includes articles and stories, trip calendar, photos, survey data, and contact information.
http://www.hongmeigui.net

International Union of Speleology [more]
Representing cavers from around the world with working groups devoted to protection and management, research, documentation, exploration and education. Includes calendar, abstracts, vacancies, history, guidelines and standards.
http://www.uis-speleo.org/

The Jamaican Caves Organisation [more]
Crew is dedicated to exploration, surveying and preservation. Includes trip reports, field notes, databases, photos and contacts.
http://www.jamaicancaves.org/