» The Virtual Cave 
- A wide-ranging introduction to the geology of caves. Organised by geological feature with pictures and clickable virtual maps.
» Bill Storage - Speleology - Photographs and articles dealing with speleology and cave exploration.
» California Underground Online Exhibits - An overview of the formation of caves, cave conservation, photography and wildlife together with local educational resources. Diagrams, pictures and slide shows.
» Cavechat.org - NSS discussion forum for US cavers including sections for cave diving, news, conservation, equipment, photography, rescue and surveying.
» Caving From Spadout - Articles on the terminology, techniques and gear used for caving. Discussion boards, editable information, feedback and links.
» UIS International Speleo Calendar - Events around the world.
» U.S. Cavers Forum - Discussion forums including caving, the NSS, the study of speleology, cave conservation and management, bats and gear.
» World Cave Database - A list of long and deep caves from all around the world. Listed by depth, length and country.
