Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
577
Unknown
387
Directory of Open Access Journals: DOAJ Articles
320
WikiBooks - Open-content textbooks
291
ArXiv.org (Cornell University Library)
202
Zenodo
127
PubMed Central (PMC)
120
DataCite
115
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
110
Wiley Online Library
86
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
81
IEEE Publications
69
MDPI Open Access Publishing
69
IEEE Publications (via Crossref)
48
Université de Nantes: HAL-UNIV-NANTES
45
LeibnizOpen (The Leibniz Association)
39
Defense Technical Information Center: DTIC Technical Reports database
37
Management University of Africa (MUA): Repository
37
ACM Publications (Association for Computing Machinery)
33
Université Grenoble Alpes: HAL
32
Central Marine Fisheries Research Institute, Kochi, India: Eprints@CMFRI
28
Springer Nature
26
Digital.CSIC (Spanish National Research Council)
25
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
25
Springer Nature (via Crossref)
25
Cambridge University Press
24
RePEc (Research Papers in Economics)
24
ScienceDirect (Elsevier - via Crossref)
24
DML-CZ (Czech Digital Mathematics Library)
23
HighWire Press (Stanford University)
22
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
22
Frontiers: Figshare
21
KRISHI Publication and Data Inventory Repository (Knowledge based Resources Information Systems Hub for Innovations in Agriculture - Indian Council of Agricultural Research, ICAR)
19
NORA (National aggregator of open repositories of Russian universities)
18
PANGAEA - Data Publisher for Earth & Environmental Science
18
Technical University of Denmark: DTU Orbit
18
The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive)
18
IOP Publishing
17
PeerJ Publishing
17
Peking University Institutional Repository (PKU IR)
16
Copernicus Publications: E-Journals
15
Frontiers (Publisher)
15
Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge
15
INSA Rennes HAL (Institut National des Sciences Appliquées)
14
Lenus - Irish Health Publications Archive (HSE - Health Service Executive)
14
Politechnical University of Valencia: RiuNet
14
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
13
DR-NTU (Digital Repository at Nanyang Technological University, Singapore)
13
Indian Agricultural Research Journals ( Indian Council of Agricultural Research)
13
University of Technology Sydney: OPUS - Open Publications of UTS Scholars
13
more ...