Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,638
LeibnizOpen (The Leibniz Association)
61
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
54
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
28
WikiBooks - Open-content textbooks
27
University of Freiburg: FreiDok
24
e-rara.ch (ETH Zürich)
20
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
19
Hathi Trust Digital Library
15
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
15
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
15
Biodiversity Heritage Library (BHL)
13
Unknown
13
Springer Nature (via Crossref)
11
BORIS (Bern Open Repository and Information System, University of Bern)
9
Directory of Open Access Journals: DOAJ Articles
8
Eberhard Karls University Tübingen: Publication System
8
OpenAgrar (OA)
8
Dresden University of Technology: Qucosa
7
EconStor (German National Library of Economics, ZBW)
7
GEO-LEOe-docs (FID GEO)
7
OPUS - Publication Server of the University of Stuttgart
7
Publication Server of Goethe University Frankfurt am Main
7
Staatsbibliothek zu Berlin: Digitised Collections
7
University of Michigan: Digital Collections
7
ETH Zürich Research Collection
6
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
6
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
6
DIAL@USL-B (Université Saint-Louis, Bruxelles)
5
DataCite
5
Share it - Open Access und Forschungsdaten-Repositorium der Hochschulbibliotheken in Sachsen-Anhalt
5
Universitäts- und Landesbibliothek Sachsen-Anhalt: Bibliotheca Ponickaviana
5
Georg-August-Universität Göttingen: GOEDOC
4
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
4
Universitätsbibliothek Paderborn: Digitale Sammlungen
4
AMAD - "Archivum Medii Aevi Digitale - Specialized open access repository for research in the middle ages"
3
Augsburg University Publication Server (OPUS)
3
Cologne University: KUPS
3
KITopen (Karlsruhe Institute of Technologie)
3
Norsk Polarinstitutt: Brage NP
3
RWTH Aachen University: RWTH Publications
3
TU Darmstadt: Digital collections
3
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
3
Zenodo
3
Digital Repository of Scientific Institutes (RCIN)
2
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
2
MACAU: Open Access Repository of Kiel University
2
Max Planck Society: MPG.PuRe
2
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
2
Norwegian Polar Institute: Brage NP
2
more ...