GeoNetwork opensource is a standards based, Free and Open Sourcecatalog application to manage spatially referenced resources through theweb. It is an OSGEO Project initiated by the Food and AgriculturalOrganization (FAO).The purpose of this presentation is to illustrate the implementation of sucha catalog in national projects in France and in Switzerland.Firstly, we will present you the Geosource project undertaken by BRGM(http://www.brgm.fr/), gathering national and local authorities, nationalgeographic survey, public organisations, associations in order to provide ametadata catalog for french users : definition of french iso profile, supportfor INSPIRE metadata requirements.Finally, we will present the SwissTopo geocat II project. The purpose of theproject is to develop the next generation geospatial catalog for SwissTopoon the basis of GeoNetwork opensource.This both projects underline the closely collaboration between nationalauthorities and the Geonetwork opensource community