Content Provider
Directory of Open Access Journals: DOAJ Articles
1,390
PANGAEA - Data Publisher for Earth & Environmental Science
1,078
DataCite Metadata Store (German National Library of Science and Technology)
1,076
Unknown
782
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
335
Copernicus Publications: E-Journals
296
Wiley Online Library
280
MDPI Open Access Publishing
272
PubMed Central (PMC)
251
LeibnizOpen (The Leibniz Association)
241
Université de Nantes: HAL-UNIV-NANTES
215
Cambridge University Press
214
Niedersächsisches Online-Archiv NOA
193
Institut national des sciences de l'Univers: HAL-INSU
186
ScienceDirect (Elsevier - via Crossref)
177
Wiley Online Library (via Crossref)
169
OLAC: Open Language Archives Community
166
Washington State University: WSU Libraries Digital Collections
127
Tomsk State University Research Library
126
Springer Nature (via Crossref)
119
Defense Technical Information Center: DTIC Technical Reports database
111
Informa (via Crossref)
107
Max Planck Society: MPG.PuRe
107
WikiBooks - Open-content textbooks
101
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
96
Zenodo
95
NORA (National aggregator of open repositories of Russian universities)
93
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
86
Lund University Publications (LUP)
83
Magnolia press
80
University of Potsdam: publish.UP
78
Université Toulouse III - Paul Sabatier: HAL-UPS
76
Archives ouvertes de Paris-Saclay
66
University of Calgary Journal Hosting
64
HAL Sorbonne Université
63
Pensoft Publishers
63
University of Copenhagen: Research
63
Météo-France: HAL
61
Altai State University: Scientific Journals of ASU
60
National Institute of Polar Research Repository, Japan
58
HELDA – University of Helsinki Open Repository
56
Siberian Federal University: Archiv Elektronnych SFU
55
University of the Pacific, McGeorge School of Law: Scholarly Commons
55
University of the Pacific: Scholarly Commons
55
University of Groningen research database
53
Wageningen UR (University & Research Centre): Digital Library
52
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
51
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
50
Hathi Trust Digital Library
49
HighWire Press (Stanford University)
49
more ...