CORE

Open Library

openlibrary.org

Anna’s Archive

annas-archive.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

Inciteful

inciteful.xyz

F1000 research

f1000research.com

Zenodo

zenodo.org

Authorea

authorea.com

Papers with Code

paperswithcode.com

PaperBrain

paperbrain.study

Crossref

crossref.org

OSF

osf.io

OA.mg

oa.mg

R Concept

covid19.researcher.life

BMC

biomedcentral.com

ROAD

road.issn.org

Hindawi

hindawi.com

ResearchHub

researchhub.com

OpenCurriculum

opencurriculum.org

ssrn.com

ssrn.com