IRDB is a service that accumulates academic information (journal articles, theses or dissertations, departmental bulletin papers, research papers, etc.) in Japanese institutional repositories can be searched for cross-sectionally.
BASE (Bielefeld Academic Search Engine) is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 100 million documents from more than 5,000 sources.
WorldCat is the world's largest network of library content and services. WorldCat libraries are dedicated to providing access to their resources (includes their institutional repositories contents) on the web.
DataCite is a leading global non-profit organisation that provides persistent identifiers (DOIs) for research data. To showcase and expose the metadata gathered, DataCite provides an integrated search interface.
B2FIND is a discovery service based on metadata steadily harvested from research data collections from EUDAT data centres and other repositories.
*EUDAT's vision is to enable data stewardship within and between European research communities.
PANGAEA is operated as an Open Access library aimed at archiving, publishing and distributing georeferenced data from earth system research. PANGAEA is hosted by the Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research (AWI) and the Center for Marine Environmental Sciences, University of Bremen (MARUM).