OERSI represents "Open Educational Resources Search Index" — a search engine for free educational materials in higher education. OERSI connects OER repositories of distributed state initiatives, institutional repositories of universities and libraries, and subject-specialized repositories for OER as a central search entry point.
OERSI is an open source-based service jointly initiated by the Hochschulbibliothekszentrum des Landes Nordrhein-Westfalen (hbz) and the Leibniz Information Centre for Science and Technology Hanover (TIB).
No content is stored in OERSI itself, only the metadata is merged and homogenised for a general search. The OERSI data structure is developed cooperatively within the Allgemeines Metadatenprofil für Bildungsressourcen (AMB). In comparison to the repositories, it is not possible to upload materials. These are made available through the connected sources. One of these sources is the ZOERR.