Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
231,906
PANGAEA - Data Publisher for Earth & Environmental Science
125,280
DataCite Metadata Store (German National Library of Science and Technology)
121,736
Directory of Open Access Journals: DOAJ Articles
101,803
Unknown
57,044
Wiley Online Library
37,260
ScienceDirect (Elsevier - via Crossref)
28,642
Springer Nature (via Crossref)
27,011
PubMed Central (PMC)
24,720
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
23,295
Cambridge University Press
22,738
ScienceDirect (Elsevier)
19,684
Université de Nantes: HAL-UNIV-NANTES
14,802
Copernicus Publications: E-Journals
12,744
Informa (via Crossref)
12,704
Open Parks Network
12,595
Institut national des sciences de l'Univers: HAL-INSU
12,339
LeibnizOpen (The Leibniz Association)
12,127
Defense Technical Information Center: DTIC Technical Reports database
11,329
Niedersächsisches Online-Archiv NOA
9,722
Wiley Online Library (via Crossref)
8,632
MDPI Open Access Publishing
8,594
HighWire Press (Stanford University)
7,634
National Institute of Polar Research Repository, Japan
7,550
University of Copenhagen: Research
7,371
Canadian Science Publishing (via Crossref)
6,890
Aarhus University: Research
6,839
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6,430
University of Tromsø: Munin Open Research Archive
6,370
Informa
6,112
eCite UTAS (University of Tasmania)
6,002
Natural Environment Research Council: NERC Open Research Archive
5,781
HAL Sorbonne Université
5,303
University of Calgary Journal Hosting
5,120
Hathi Trust Digital Library
5,075
Digital.CSIC (Spanish National Research Council)
5,074
Oxford University Press
4,873
Oxford University Press (via Crossref)
4,677
Technical University of Denmark: DTU Orbit
4,202
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
4,190
Memorial University of Newfoundland: Research Repository
4,168
Zenodo
4,151
Biodiversity Heritage Library (BHL)
3,978
Canadian Science Publishing
3,780
Ohio State University (OSU): Knowledge Bank
3,679
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
3,521
WikiBooks - Open-content textbooks
3,415
Institute for Marine Research: Brage IMR
3,316
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
3,210
University of Lethbridge Digitized Collections
3,145
more ...