The German Environmental Agency has implemented a geo portal application to meet the European Union regulation for a Pollutant Release and Transfer Registry (PRTR). It is based completely on Open Source software running Debian, Postgres and the OSGeo SDI stack with PostGIS, MapServer, Apache and Mapbender.
The background maps have been created from OpenStreetMap data. The data has been generalized and processed to meet the performance needs of the application. Maps are rendered using MapServer and served through the OGC WMS standard. The application meets the European INSPIRE directive and PRTR.
Many SDIs and geoportal applications operated by the German government already rely completely on Free and Open Source Software. On top of this the PRTR portal uses now also uses freely available community crowd based spatial data as background maps.