- Deutsche Nationalbibliothek - German National Library
- Verzeichnis der deutschsprachigen abfragbaren Kataloge und Institutionen - Directory of library catalogues
- German libraries online - A survey of German libraries offering services in the World Wide Web (compiled by the Hochshulsbibliothekszentrum NRW in Köln)
- Bibliotheksdienste im Internet - State institution providing service for libraries, museums, and archives
- Federal Union of German Library and Information Associations (BID) - German library organization