Top catalogs
Karlsruher Virtueller Katalog (KVK)
Search interface for more than 500 million books in library catalogs and book trade catalogs worldwide
Südwestdeutscher Bibliotheksverbund (SWB)
Includes the collections of academic libraries in Baden-Wuerttemberg, Saarland, and Saxony
Elektronische Zeitschriftenbibliothek (EZB)
Access to academic e-journals; open-access articles; access partially limited to subscribing libraries
Zeitschriftendatenbank (ZDB)
Includes print and electronic journal and newspaper collections from approx. 4000 academic libraries in Germany and Austria; no article titles available
Bielefeld Academic Search Engine (BASE)
Interdisciplinary search engine for academic online resources