https://en.wikipedia.org/wiki/List_of_preprint_repositories

AAS Open Research Multidisciplinary archive, with GitHub repository for rolling your own pre-print archive

AMRC Open Research Medicine At least one of the authors must be affiliated with AMRC member charities 45 2019 Association of Medical Research Charities & F1000 Research Ltd

agriRxiv Agriculture Global preprint service for agriculture and allied sciences 418 2017 Open Access India & CAB International

APSA Preprints Political science Early research outputs in political science and related disciplines 349 2019 American Political Science Association & Cambridge University Press

arXiv Multidisciplinary Main focus: mathematics, physics, astronomy, computer science, quantitative biology, statistics, quantitative finance and economics 1,890,028 1991 Cornell University

AfricArXiv Multidisciplinary Preprint server for interdisciplinary research in Africa 186 2018 Center for Open Science

Arabixiv Multidisciplinary Arabic Preprint Server 493 2018 Center for Open Science

ARPHA Preprints Multidisciplinary The submission systems limited to the participating ARPHA journals 14 2020 Pensoft Publishers

Authorea[3] Multidisciplinary A collaborative writing platform that can be used as preprint server 11,334 2013 Atypon

Beilstein Archives Multidisciplinary Preprint server for Beilstein journals 305 2019 Beilstein Institut

BioHackrXiv Life Sciences Preprint server to report on works done during BioHackathons, CodeFests, Sprints or similar events 8 2020 Center for Open Science

bioRxiv[4] Biology Open access preprint repository for the biological sciences 106,783 2013 Cold Spring Harbor Laboratory

BodoArXiv Medieval Studies Open Repository for Medieval Studies 71 2019 ScholarlyHub & Center for Open Science

Cell Sneak Peek Biology Manuscript under review in Cell Press journals 3,375 2018 Elsevier

ChemRxiv[5] Chemistry Open access preprint archive for chemistry 13,865 2017 American Chemical Society, Royal Society of Chemistry & German Chemical Society

ChinaXiv Multidisciplinary Preprint server for interdisciplinary research in China 14,361 2016 National Science Library, Chinese Academy of Sciences

Cogprints Multidisciplinary Psychology, Neuroscience, Linguistics, Computer Science, Philosophy, and Biology 4,230 1997–2017 University of Southampton

CrimRxiv Criminology Criminology’s open archive 187 2020 Criminology Open (Ltd).

Cryptology ePrint Archive Cryptography Open access preprint archive for cryptography 1,590 1996 International Association for Cryptologic Research

EarthArXiv[6] Earth science All subdomains of Earth Science and related domains of planetary science 1,862 2017 California Digital Library

EcoEvoRxiv Ecology A free preprint service for ecology, evolution and conservation 366 2018 Center for Open Science

ECSarXiv Electrochemistry a free preprint service for electrochemistry and solid state science and technology 172 2018 Center for Open Science

EdArXiv Education A Preprint Server For The Education Research Community 620 2019 Center for Open Science

engrXiv[7] Engineering Open archive of engineering preprints 1,431 2016 Open Engineering Inc

ESSOAr Earth science Earth and space science preprints and conference posters 2,526 2018 American Geophysical Union, Atypon, & Wiley

Eyexiv Vision science The Eye Open Repository, Preprints for ophthalmology, optometry, and vision science 300 2022 International Virtual Ophthalmic Research Center

E-LIS Library science Eprints in Library and Information Science 22,519 2003 E-LIS Governance & CIEPI

F1000 Research Life Sciences Preprint server with integrated option of peer review by invited experts, suggested by the authors, done openly after publication 3,790 2012 F1000 Research Ltd.

FocUS Archive Ultrasound research A free preprint service for the focused ultrasound research community 43 2018 Center for Open Science

Frenxiv Multidisciplinary French server for preprints 149 2018 Center for Open Science

Gates Open Research Multidisciplinary A platform for rapid author-led publication and open peer review of research funded by the Bill & Melinda Gates Foundation 286 2017 Bill & Melinda Gates Foundation

HAL[8] Multidisciplinary Open archive for scholarly documents from all academic fields 842,398 2001 Centre pour la communication scientifique directe

HRB Open Research Medicine A preprint platform for HRB-funded researchers 157 2018 Health Research Board & F1000 Research Ltd. hprints Arts and humanities Nordic Arts and Humanities and Social

Sciences Open Access repository 274 2008 French National Centre for Scientific Research & Nordbib

INArxiv Multidisciplinary Preprint server for interdisciplinary research in Indonesia 16,489 2017–2020 Center for Open Science

IndiaRxiv Multidisciplinary Preprint server for interdisciplinary research in India 134 2019 Open Access India, Center for Open Science & Society for Promotion of Horticulture

Jxiv Multidisciplinay Preprint server in Japan[9] 1 2022 Japan Science and Technology Agency

JMIR Preprints Medicine Preprint server by publisher JMIR Publications mainly for open review of JMIR submissions 2200 (2018)[10] 2009[11] JMIR Publications

LawArXiv Law Archive for legal research 1,366 2017–2020 Center for Open Science

LISSA Library science Library and Information Sciences Scholarship Archive 301 2018 Center for Open Science

MarXiv Marine science Repository for ocean and marine-climate science. Closed. 458 2017–2020 Center for Open Science

MediArXiv Communication sciences Preprints for media, film, and communication research 112 2019 Center for Open Science

medRxiv[12] Medicine Open access preprint archive for medicine 14,831 2019 Cold Spring Harbor Laboratory

MetaArXiv Multidisciplinary Focused on improving research transparency and reproducibility 200 2018 Center for Open Science

MindRxiv Multidisciplinary Preprints on mind and contemplative practices 215 2018 Center for Open Science

Nature Precedings Multidisciplinary Preprint repository of scholarly work in the fields of biomedical sciences, chemistry, and earth sciences 3,423 2007–2012 Nature Publishing Group

NutriXiv Nutritional sciences Preprint service for the nutritional sciences 81 2018 Center for Open Science

OSF Preprints Multidisciplinary Aggregates over 30 preprint servers (all from COP plus other like arXiv, bioRxiv, etc.). Number of native OSF Preprints documents: 25,114. 2,289,894 2017 Center for Open Science

PaleorXiv[13] Paleontology Preprint server for paleontology 174 2017 Center for Open Science

PeerJ PrePrints[14] Biology, medicine Initially, developed as preprint server for PeerJ submissions. Closed Sep 30th 2019. 5,086 2013–2019 O’Reilly Media & SAGE Publishing

PhilSci-Archive Philosophy of science An archive for preprints in philosophy of science 8,636 2001 D-Scribe Digital Publishing

Preprints with The Lancet Medicine Preprints available via SSRN 7,238 2018 Elsevier

Preprints.org Multidisciplinary Preprint server for interdisciplinary research governed by MDPI 24,000 2016 MDPI

Preprints.ru Multidisciplinary Preprint server for interdisciplinary research in Russia 228 2019 NEICON

PsyArXiv[15] Psychology Open access preprint archive for psychology 13,211 2016 Society for the Improvement of Psychological Science

RePEc Economics Research in economics 3,400,000 1997 Federal Reserve Bank of St. Louis

Research Square Multidisciplinary Preprint server plus editing (commercial) 98,741 2018 Research Square R&D LLC

Rutgers Optimality Archive Linguistics A distribution point for research in Optimality Theory and its conceptual affiliates 1250 1993 School of Arts and Sciences at Rutgers University

SciELO Preprints Multidisciplinary Interdisciplinary research for Latin America, Iberian Peninsula, South Africa 13,713 2020 SciELO

SocArXiv Social science Open archive of the social sciences 6879 2016 Center for Open Science

SportRxiv Sports science Repository dedicated to sport and exercise related research 279 2017 Center for Open Science

SSRN (First Look) Multidisciplinary Aggregates over 30 preprint servers (Preprints with The Lancet, Cell Sneak Peek, etc.). More than 55 disciplines. Initially funded by SSRN in 1994, bought in 2016 by Elsevier. 950,733 1994 Elsevier

TechRxiv Engineering Preprints in Technology Research 1,043 2020 Institute of Electrical and Electronics Engineers

ViXra[16] Multidisciplinary Mainly physics and mathematics, but also other. An alternative to arXiv. Well-known for also having many unorthodox papers and also fringe science. 37,113 2009 Scientific God Inc.

Wellcome Open Research Multidisciplinary At least one of the authors must be a Wellcome researcher 820 2017 Wellcome Trust

WikiJournal Preprints Multidisciplinary Preprint repository of scholarly work in a MediaWiki format 52 2017 WikiJournal User Group

Zenodo Multidisciplinary Preprint repository of scholarly work 792,588 2011 OpenAIRE / CERN