CORE

Anna’s Archive

annas-archive.org

Open Library

openlibrary.org

Academia.edu

academia.edu

MIT Open Library

openlearning.mit.edu

MIT OpenCourseWare

ocw.mit.edu

arXiv.org

arxiv.org

Wiley Online Library

onlinelibrary.wiley.com

Oxford Academic

academic.oup.com

F1000 research

f1000research.com

Inciteful

inciteful.xyz

Papers with Code

paperswithcode.com

Zenodo

zenodo.org

OSF

osf.io

PaperBrain

paperbrain.study

Authorea

authorea.com

OA.mg

oa.mg

Crossref

crossref.org

ResearchHub

researchhub.com

R Concept

covid19.researcher.life

ssrn.com

ssrn.com

BMC

biomedcentral.com

OpenCurriculum

opencurriculum.org

ROAD

road.issn.org

Hindawi

hindawi.com