International Geothermal Association - Contains extensive information about geothermal energy around the world. A great source for finding publications, photographs, and data about geothermal efforts world-wide.
GeoForschungsZentrum Potsdam (GFZ), Germany's National Research Centre for Geosciences. Section (or department) 5.2, Geothermics, researches geothermal energy technologies.
The IEA Heat Pump Centre (HPC) is an international information service for heat pumping technologies, applications and markets. The goal is to accelerate the implementation of heat pumps and related heat pumping technologies, including air conditioning and refrigeration.
Hot Dry Rocks Pty Ltd is an Australian based geothermal exploration and development consultancy.
European Geosciences Unionís official website. The EGU is a product of the merger of European Geophysical Society and the European Union of Geosciences. The EGU promotes cooperation between scientists and promotes the sciences of the Earth and its environment.