Hong Meigui Cave Exploration Society
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
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
Crew is dedicated to exploration, surveying and preservation. Includes trip reports, field notes, databases, photos and contacts.
http://www.jamaicancaves.org/