OERSIOERSI stands for Open Educational Resources Search Index - a search engine for free educational materials in higher education. As a central search entry point, OERSI connects OER repositories of distributed state initiatives, institutional repositories of universities and libraries, and subject-specialized repositories for OER. Over 75,000 titles are indexed.
OERSI is a jointly initiated project by the Hochschulbibliothekszentrum des Landes Nordrhein-Westfalen (hbz) and the German National Library of Science and Technology.