An excellent overview of active groups is found at this link: http://laos.eegc.org/liens.php

Claude Mouret and Francois Vacquié (France)

The group around Claude Mouret explores the caves in Khammouane since 1992. They published many articles in the French caving magazine Spelunca. Helmut Steiner participates in their expeditions since 2003.

Khammouanne Group (France)

This group originates of members from the first expeditions of Claude Mouret. It is currently coordinated by Charles Ghommidh. The results are documented in an excellent website:  http://www.explo-laos.com

The group around Vang Vieng (Paris, France)

This French group focuses on the area around Vang Vieng in central Laos. The last expeditions targeted areas in the Northern area close to Kasi. The reports of the expeditions with an good summary and cave maps are published at:: http://laos.eegc.org               http://khaonyao2010.canalblog.com/

The Amis Cave Exploration 2000 (Netherlands)

The Dutch cave exploration was the first full scale expedition to Northern Laos in 2000. The results are available at www.speleo.nl/laos .

The French-Romanian Caving and Cave Diving Expedition

This group started it activities in the Khammouane area in 2006 and  is active again in a new setup extending its diving activities also into neighboring Vietnam: http://www.en.expe-laos.com