Content Provider
Cambridge University Press
8,315
Informa (via Crossref)
2,515
DataCite Metadata Store (German National Library of Science and Technology)
1,363
JSTOR (via Crossref)
1,237
Directory of Open Access Journals: DOAJ Articles
877
Informa
702
Unknown
639
Wiley Online Library
581
Wiley Online Library (via Crossref)
393
Springer Nature (via Crossref)
378
ScienceDirect (Elsevier - via Crossref)
332
LeibnizOpen (The Leibniz Association)
310
CyberLeninka (Scientific Electronic Library)
295
PANGAEA - Data Publisher for Earth & Environmental Science
285
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
282
Open Parks Network
260
SAGE Publications (via Crossref)
195
UNESDOC - UNESCO Digital Library
166
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
150
Brill (via Crossref)
148
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
136
MDPI Open Access Publishing
124
Zenodo
118
Frontiers: Figshare
113
SAGE Publications
107
SSOAR - Social Science Open Access Repository
107
Croatian Digital Theses Repository (National and University Library in Zagreb)
98
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
98
University of North Texas: UNT Digital Library
92
Université de Nantes: HAL-UNIV-NANTES
91
University of Calgary Journal Hosting
89
Digital.CSIC (Spanish National Research Council)
88
University of California: eScholarship
80
Arctic Data Center (via DataONE)
79
Defense Technical Information Center: DTIC Technical Reports database
73
ScienceDirect (Elsevier)
73
Ural Federal University (URFU): ELAR
70
Siberian Federal University: Archiv Elektronnych SFU
69
University of Iceland: Peer Reviewed Journals
64
Digital Library of University of Maribor
62
NORA (National aggregator of open repositories of Russian universities)
61
Opin vísindi (Iceland)
54
Umeå University: Publications (DiVA)
52
WHO (World Health Organization): Institutional Repository for Information Sharing (IRIS)
48
NOAA NCEI Environmental Data Archive (via DataONE)
47
The World Bank: Open Knowledge Repository (OKR)
47
De Gruyter (via Crossref)
46
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
43
Luleå University of Technology Publications (DiVA)
43
Theseus.fi (Open Repository of the Universities of Applied Sciences)
43
more ...