Openarchives.gr is a federated search engine harvesting 57 Greek digital libraries and institutional repositories. Designed and implemented by V.Banos, openarchives.gr was lunched in 2006 and it is currently providing access to 424,278 documents. Today, the openarchives.gr aggregator is being hosted, managed and developed by the National Documentation Center (EKT) and its index is updated on a daily basis. Within the frame of NIRST, EKT in cooperation with the portal’s creator continuously enhances openarchives.gr with new features.