Content Provider
Directory of Open Access Journals: DOAJ Articles
51,162
ScienceDirect (Elsevier - via Crossref)
5,014
Springer Nature (via Crossref)
4,894
Unknown
4,643
DataCite Metadata Store (German National Library of Science and Technology)
4,058
Wiley Online Library (via Crossref)
2,905
LeibnizOpen (The Leibniz Association)
2,608
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
2,591
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
2,421
Niedersächsisches Online-Archiv NOA
2,394
Cambridge University Press
2,231
University of Calgary Journal Hosting
2,129
Informa (via Crossref)
1,960
Wiley Online Library
1,915
University of Tromsø: Munin Open Research Archive
1,562
Université de Nantes: HAL-UNIV-NANTES
1,495
Aarhus University: Research
1,419
Canadian Science Publishing (via Crossref)
1,319
ScienceDirect (Elsevier)
1,301
RePEc (Research Papers in Economics)
1,173
Institut national des sciences de l'Univers: HAL-INSU
1,099
IOP Publishing (via Crossref)
1,036
University of California: eScholarship
1,014
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
966
Arctic Institute of North America (via Crossref)
911
Natural Environment Research Council: NERC Open Research Archive
906
Zenodo
891
Max Planck Society: MPG.PuRe
802
JSTOR (via Crossref)
778
University of Copenhagen: Research
717
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
628
Oxford University Press (via Crossref)
585
University of Bergen: Bergen Open Research Archive (BORA-UiB)
526
Frontiers (Publisher)
507
Lund University Publications (LUP)
473
Digital.CSIC (Spanish National Research Council)
453
SAGE Publications (via Crossref)
444
LaCRIS - University of Lapland Current Research System
442
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
436
Biodiversity Heritage Library (BHL)
429
Polar Research (E-Journal)
419
HELDA – University of Helsinki Open Repository
418
University of Groningen research database
398
University College London: UCL Discovery
393
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
386
Institute for Marine Research: Brage IMR
385
Informa
374
Canadian Science Publishing
373
University of Southampton: e-Prints Soton
369
White Rose Research Online (Universities of Leeds, Sheffield & York)
368
more ...