IMIS/RC “Athena”, in line with its research and development interests, and driven by the goal to effectively assist the Hellenic Public Administration by offering knowhow and expertise in issues related to the management and fusion of geoinformation, has completed the design and development of the web service www.geodata.gov.gr. The service www.geodata.gov.gr enables the public administration to offer publishing, searching and displaying of open geospatial data to citizens. The development of www.geodata.gov.gr was based solely on Open Source Software and open standards. The service was developed by IMIS/RC “Athena”, in cooperation with the eGovernment Team of the Prime Minister’s Office, the Hellenic Mapping and Cadastral Organization, and the Ministry of Environment, Energy, and Climate Change.