"Helios" repository offers open and unrestricted access to the National Hellenic Research Foundation’s scientific collections. It has been developed by the National Documentation Centre (EKT) and includes a rich database of articles, books, audios and videos, posters, monographs, patterns, educational materials, technical reports, conference proceedings etc). Metadata for more than 4,000 scientific publications are already available, and about 1,000 full text entries. Helios repository is available both in Greek and English. The repository’s content is continuously updated and enriched with new articles and publications.