Content Provider
Directory of Open Access Journals: DOAJ Articles
50,455
DataCite Metadata Store (German National Library of Science and Technology)
23,657
PANGAEA - Data Publisher for Earth & Environmental Science
18,672
Unknown
10,854
ScienceDirect (Elsevier - via Crossref)
4,997
Springer Nature (via Crossref)
4,595
PubMed Central (PMC)
3,827
Defense Technical Information Center: DTIC Technical Reports database
3,556
Copernicus Publications: E-Journals
3,533
Open Parks Network
3,531
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3,251
Wiley Online Library
3,162
Wiley Online Library (via Crossref)
3,078
LeibnizOpen (The Leibniz Association)
2,919
Cambridge University Press
2,520
Niedersächsisches Online-Archiv NOA
2,404
University of Tromsø: Munin Open Research Archive
2,224
University of Calgary Journal Hosting
2,125
Aarhus University: Research
2,014
MDPI Open Access Publishing
1,994
Institut national des sciences de l'Univers: HAL-INSU
1,931
Université de Nantes: HAL-UNIV-NANTES
1,897
Arctic Council Repository
1,877
Informa (via Crossref)
1,845
University of Copenhagen: Research
1,414
Canadian Science Publishing (via Crossref)
1,375
ScienceDirect (Elsevier)
1,301
Biodiversity Heritage Library (BHL)
1,142
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1,141
Zenodo
1,130
LaCRIS - University of Lapland Current Research System
1,062
Hathi Trust Digital Library
1,042
HAL Sorbonne Université
919
Technical University of Denmark: DTU Orbit
835
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
761
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
726
Max Planck Society: MPG.PuRe
722
University of Alaska: ScholarWorks@UA
708
Institute for Marine Research: Brage IMR
702
National Institute of Polar Research Repository, Japan
682
University of Bergen: Bergen Open Research Archive (BORA-UiB)
680
NTNU Open Archive (Norwegian University of Science and Technology)
675
HighWire Press (Stanford University)
663
Lund University Publications (LUP)
648
University of North Texas: UNT Digital Library
640
Natural Environment Research Council: NERC Open Research Archive
613
Arctic Portal Library
583
Canadian Science Publishing
574
Informa
561
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
556
more ...