The paper describes a set of software tools and methodologies followed by the Hellenic Aggregator and Greek cultural, educational and scientific institutions in order to contribute their content to Europeana. The software tools are presented and their impact on the publishing, aggregation and dissemination process of Greek content to Europeana is described. The work of the Hellenic Aggregator, the methodologies developed and the new software tools, which were created, improved the publishing process of Greek institutions and promoted their content to Europeana. During this process, difficult technical challenges were overcome and a clear path has been created for Greek content providers who would like to publish their content to Europeana. Without these software and methodologies, harvesting Greek digital content from Europeana would not be possible. The present study outlines also the work on supporting Europeana Semantic Elements (ESE) metadata schema.