Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
6,585
Directory of Open Access Journals: DOAJ Articles
867
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
816
Frankfurt/Main University Library: Digitale Sammlungen
712
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
526
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
506
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
442
Springer Nature (via Crossref)
410
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
387
Unknown
354
WikiBooks - Open-content textbooks
354
Biodiversity Heritage Library (BHL)
345
DataCite
242
LeibnizOpen (The Leibniz Association)
233
OpenAgrar (OA)
212
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
209
German Aerospace Center: elib - DLR electronic library
199
Hathi Trust Digital Library
199
University of Freiburg: FreiDok
191
University of Michigan: Digital Collections
187
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
170
Zenodo
142
Publication Server of Goethe University Frankfurt am Main
141
GEO-LEOe-docs (FID GEO)
124
University of Vienna: Phaidra
101
Max Planck Society: MPG.PuRe
96
da|ra - Registration agency for social and economic data
91
Georg-August-Universität Göttingen: GOEDOC
88
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
83
Wiley Online Library
81
e-rara.ch (ETH Zürich)
76
BORIS (Bern Open Repository and Information System, University of Bern)
75
Digital Repository of Scientific Institutes (RCIN)
68
KITopen (Karlsruhe Institute of Technologie)
61
University of Potsdam: publish.UP
55
Publication Server of the Justus-Liebig-University of Giessen
54
Thieme
54
Doria (National Library of Finland)
53
the clark - Digital Collections (Sterling and Francine Clark Art Institute Library)
49
Staatsbibliothek zu Berlin: Digitised Collections
48
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
45
Federation of Finnish Learned Societies: Scientific Journals Online
42
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
41
Norsk Polarinstitutt: Brage NP
39
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
39
Universitäts- und Landesbibliothek Sachsen-Anhalt: Bibliotheca Ponickaviana
39
EconStor (German National Library of Economics, ZBW)
38
Norwegian Polar Institute: Brage NP
37
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server
36
RWTH Aachen University: RWTH Publications
36
more ...