European Space Agency (ESA)
The European Space Agency (ESA), headquatered in Paris, France, is an intergovernmental organisation dedicated to the exploration of space.
ESA had 10 founding members: Belgium, Denmark, France, Germany, Italy, the Netherlands, Spain, Sweden, Switzerland and the United Kingdom.
The member states that joined the Agency later are: Ireland, Norway, Austria, Finland, Portugal, Greece, Luxembourg, the Czech Republic and Romania (in chronological order).
Canada has been an Associate Member of ESA since 1979.
Hungary has been a Cooperating State since 2003 and can participate ESA projects through PECS (Plan for European Cooperating State).
Source: Wikipedia