Content Provider
Directory of Open Access Journals: DOAJ Articles
773
DataCite Metadata Store (German National Library of Science and Technology)
554
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
442
Springer Nature (via Crossref)
410
Unknown
272
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
208
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
195
OpenAgrar (OA)
131
Publication Server of Goethe University Frankfurt am Main
106
GEO-LEOe-docs (FID GEO)
77
LeibnizOpen (The Leibniz Association)
62
Thieme (via Crossref)
48
Wiley Online Library
46
Federation of Finnish Learned Societies: Scientific Journals Online
42
German Aerospace Center: elib - DLR electronic library
41
BORIS (Bern Open Repository and Information System, University of Bern)
32
Wiley Online Library (via Crossref)
32
University of Freiburg: FreiDok
31
KITopen (Karlsruhe Institute of Technologie)
28
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server
28
Max Planck Society: MPG.PuRe
27
JKI Open Journal Systems (Julius Kühn-Institut)
24
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
24
University of Potsdam: publish.UP
21
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
20
Estonian Academy Publishers
18
Informa (via Crossref)
18
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
16
Contributions to Entomology = Beiträge zur Entomologie (E-Journal)
13
PUB - Publications at Bielefeld University
12
Wissenschaftliche Verlagsgesellschaft Stuttgart (via Crossref)
12
Martin-Luther-Universität Halle-Wittenberg - Universitäts- und Landesbibliothek Sachsen-Anhalt (E-Journal)
11
RegionaliaOpen – Open-Access-Publikationsserver für den Südwesten
11
University of Tromsø: Septentrio Academic Publishing
11
Hereon Publications (Helmholtz-Zentrum)
10
Justus-Liebig-Universität Giessen: JLUpub
10
Zenodo
8
Böhlau Verlag (via Crossref)
7
ScienceDirect (Elsevier - via Crossref)
7
AMAD - "Archivum Medii Aevi Digitale - Specialized open access repository for research in the middle ages"
6
Biologie in unserer Zeit (BiuZ - E-Journal)
6
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
6
Henry - Hydraulic Engineering Repository
6
Hrčak - Portal of scientific journals of Croatia
6
PuSH - Publikationsserver des Helmholtz Zentrums München
6
Publication Server of the Justus-Liebig-University of Giessen
6
RWTH Aachen University: RWTH Publications
6
SZTE OJS Journals (University of Szeged)
6
University of Copenhagen: Research
6
University of Groningen research database
6
more ...