Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
16,883
Directory of Open Access Journals: DOAJ Articles
1,741
Zenodo
1,258
Unknown
1,108
PANGAEA - Data Publisher for Earth & Environmental Science
1,078
CyberLeninka (Scientific Electronic Library)
946
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
852
Arctic Data Center (via DataONE)
517
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
431
OLAC: Open Language Archives Community
411
NORA (National aggregator of open repositories of Russian universities)
329
Copernicus Publications: E-Journals
296
Wiley Online Library
289
MDPI Open Access Publishing
272
Université de Nantes: HAL-UNIV-NANTES
270
LeibnizOpen (The Leibniz Association)
255
PubMed Central (PMC)
251
University of Washington, Seattle: Digital Collections
244
Cambridge University Press
235
Tomsk State University Research Library
212
Siberian Federal University: Archiv Elektronnych SFU
200
Niedersächsisches Online-Archiv NOA
193
Institut national des sciences de l'Univers: HAL-INSU
190
ScienceDirect (Elsevier - via Crossref)
181
David Rumsey Historical Map Collection (Cartography Associates)
178
Wiley Online Library (via Crossref)
175
Max Planck Society: MPG.PuRe
165
IOP Publishing (via Crossref)
152
Altai State University: Scientific Journals of ASU
147
University of Michigan: Digital Collections
144
Springer Nature (via Crossref)
136
Informa (via Crossref)
128
Washington State University: WSU Libraries Digital Collections
128
RePEc (Research Papers in Economics)
127
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
116
Defense Technical Information Center: DTIC Technical Reports database
111
WikiBooks - Open-content textbooks
111
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
103
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
96
University of Tyumen: UTMN Repository
92
Lund University Publications (LUP)
83
Université Toulouse III - Paul Sabatier: HAL-UPS
82
Frontiers: Figshare
81
Magnolia press
80
Oxford University Press (via Crossref)
79
University of Potsdam: publish.UP
79
Tomsk Polytechnic University (TPU): Electronic Archive
74
Archives ouvertes de Paris-Saclay
72
Kazan Federal University Digital Repository
70
Ural Federal University (URFU): ELAR
70
more ...