Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,551
Directory of Open Access Journals: DOAJ Articles
800
Unknown
584
PubMed Central (PMC)
251
Wiley Online Library (via Crossref)
230
Copernicus Publications: E-Journals
196
PANGAEA - Data Publisher for Earth & Environmental Science
189
Wiley Online Library
180
University of Calgary Journal Hosting
160
Springer Nature (via Crossref)
149
University of Tromsø: Munin Open Research Archive
142
Lund University Publications (LUP)
138
MDPI Open Access Publishing
135
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
128
Aarhus University: Research
124
Niedersächsisches Online-Archiv NOA
124
Canadian Science Publishing (via Crossref)
111
ScienceDirect (Elsevier - via Crossref)
95
Université de Nantes: HAL-UNIV-NANTES
92
University of Copenhagen: Research
90
Wageningen UR (University & Research Centre): Digital Library
88
Defense Technical Information Center: DTIC Technical Reports database
83
LeibnizOpen (The Leibniz Association)
78
HELDA – University of Helsinki Open Repository
68
Umeå University: Publications (DiVA)
67
Cambridge University Press
57
University of Groningen research database
57
University of North Texas: UNT Digital Library
53
Jultika - University of Oulu repository
50
University of California: eScholarship
49
Informa (via Crossref)
45
Theses Canada/Thèses Canada (Library and Archives Canada)
44
University of Alaska: ScholarWorks@UA
43
NTNU Open Archive (Norwegian University of Science and Technology)
42
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
40
National Institute of Polar Research Repository, Japan
38
Max Planck Society: MPG.PuRe
35
University of Stirling: Stirling Digital Research Repository
33
University of Texas at El Paso: Digital Commons@UTEP
33
Institut national des sciences de l'Univers: HAL-INSU
32
University of Potsdam: publish.UP
32
Canadian Science Publishing
31
Norwegian Institute for Nature Research: Brage NINA
30
HighWire Press (Stanford University)
28
Queen's University, Ontario: QSpace
28
Natural Resources Institute Finland: Jukuri
27
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
27
Polar Research (E-Journal)
27
WikiBooks - Open-content textbooks
27
Carleton University's Institutional Repository
26
more ...