Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
6,177
Arctic Data Center (via DataONE)
2,389
Directory of Open Access Journals: DOAJ Articles
1,598
Unknown
1,541
Wiley Online Library
1,025
Zenodo
998
OLAC: Open Language Archives Community
833
Dryad Digital Repository (Duke University)
668
Springer Nature (via Crossref)
601
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
551
Wiley Online Library (via Crossref)
531
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
530
PubMed Central (PMC)
510
PANGAEA - Data Publisher for Earth & Environmental Science
466
CyberLeninka (Scientific Electronic Library)
393
Oregon Digital (University of Oregon/Oregon State University)
359
University of California: eScholarship
322
ScienceDirect (Elsevier - via Crossref)
319
Copernicus Publications: E-Journals
316
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
275
Informa (via Crossref)
271
Canadian Science Publishing (via Crossref)
266
MDPI Open Access Publishing
265
University of Calgary Journal Hosting
260
University of Copenhagen: Research
242
Aarhus University: Research
241
Cambridge University Press
231
Niedersächsisches Online-Archiv NOA
220
Lund University Publications (LUP)
219
University of Tromsø: Munin Open Research Archive
211
LeibnizOpen (The Leibniz Association)
208
Wageningen UR (University & Research Centre): Digital Library
202
University of Michigan: Digital Collections
179
Université de Nantes: HAL-UNIV-NANTES
177
Max Planck Society: MPG.PuRe
173
University of Alaska: ScholarWorks@UA
173
ESS-DIVE: Deep Insight for Earth Science Data (via DataONE)
171
WikiBooks - Open-content textbooks
164
Defense Technical Information Center: DTIC Technical Reports database
150
University of Lethbridge Digitized Collections
143
HELDA – University of Helsinki Open Repository
127
Oxford University Press (via Crossref)
127
LaCRIS - University of Lapland Current Research System
126
Canadian Science Publishing
124
Institut national des sciences de l'Univers: HAL-INSU
122
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
118
Informa
112
Umeå University: Publications (DiVA)
111
NORA (National aggregator of open repositories of Russian universities)
110
RePEc (Research Papers in Economics)
110
more ...