• AcademicJournals
    Over 100 academic open access journals, many from developing countries

  • AGORA: Access to Global Online Research in Agriculture
    Free or low cost access to over 15,000 journals and 50,000 books for developing countries

  • agrirXiv (CABI)
    Open access to millions of agriculture-related preprints

  • AJOL: African Journals Online (International Network for the Availability of Scientific Publications – INASP)
    Access to over 500 African scientific journals; no free full text, but with document delivery service

  • AMEDEO: The Medical Literature Guide
    Current awareness service + index of medical articles; free abstracts

  • arXiv (Cornell University)
    Open access to millions of physics and other sciences preprints

  • ASIAJOL: Asia Journals Online
    Portal to scholarly journals published in Bangladesh, Nepal, The Philippines, Vietnam, Sri Lanka and Indonesia

  • ASM Journals
    Access to 18 American Society for Microbiology journals; free for all after 4 months

  • BASE: Bielefeld Academic Search Engine
    Open access repositories harvester: hundreds of millions of documents from over 9,000 repositories

  • Berkeley Electronic Press
    “bepress: the new standard in scholarly publisher”

  • Bioline International (Brazil)
    Over 50 open access journals from various developing countries

  • BioMed Central: BMC Journals
    Over 300 digital-only open access journals

  • biorXiv (Cold Spring Harbor Laboratory)
    Open access to millions of life sciences preprints

  • CAIRN: Chercher, Repérer, Avancer
    500 revues de sciences humaines et sociales

  • chemrXiv (various societies)
    Open access to millions of chemistry preprints

  • COBRA: Collection of Biostatistics Research Archive (bepress)
    Combined electronic resource of (mostly American) institutions

  • DDB: Deutsche Digitale Bibliothek

  • DOAB: Directory of Open Access Books (OAPEN Foundation)
    Some 44,000 open access books

  • DOAJ: Directory of Open Access Journals (Lund University Libraries)
    Portal with some 17,000 bona fide open access journals

  • DPLA: Digital Public Library of America (Lund University Libraries)
    A wealth of knowledge from libraries, archives, and museums: over 44,000,000 items

  • Elektronische Zeitschriftenbibliothek (Universitätsbibliothek Regensburg)
    Links to electronic journal editions

  • eprints.org
    Self archiving and open archives; OAI compliant, over 250 archives, over 500,000 documents

  • Europe PMC
    European alternative to open access repository PubMed Central

  • Europeana
    Europe’s Galleries, Libraries, Archives and Museums; over 60,000,000 items from 34 countries

  • Free Medical Journals (Geneva Foundation for Medical Education and Research)
    Links to electronic journal editions

  • Free Medical Journals Site (AmedeoGroup)
    Over 5,000 free journals; with current awareness service

  • FreeFullPDF.com
    Over 80 million free scientific articles

  • GMS: German Medical Science (Germany)
    Links to open access German medical articles

  • GreyNet: Grey Literature Network Service
    Search ‘grey’ literature

  • HighWire Press (Stanford University Library)
    Over 4,000 journals, partially free

  • HINARI: Health Internetwork Access to Research Initiative
    Free or low cost access to over 21,000 journals and over 69,000 e-books for developing countries

  • HORIZON: Pleins textes (IRD, France)
    Open access to IRD (formerly: ORSTOM) documents

  • INTECH
    Open access publisher of over 5,400 scientific e-books

  • IRIS: Institutional Repository for Information Sharing (WHO)

  • J-STAGE (Japanese Science and Technology Information Aggregator, Electronic)
    Links to over 3,000 Japanese electronic journals

  • JSTOR Project
    Redefining access to scholarly literature

  • medrXiv (Colde Spring Harbor Laboratory et al.)
    Open access to millions of health sciences preprints

  • MSF Field Research (Médecins Sans Frontières)
    Open access repository of MSF members publications”

  • NARCIS (Netherlands)
    Digital Academic Repositories – Digital library system for universities

  • NISC: National Inquiry Services Centre (South Africa)
    African databases and journals

  • OAIster (OCLC / WorldCat)
    Over 50,000,000 items from over 2,000 digital academic open archives

  • OARE: Access to Research in the Environment
    Free or low cost access to over 6,000 journals and e-books for developing countries

  • OpenAIRE: Open Access Infrastructure for European Research (EU)
    Over 20,000,000 items from over 2,700 repositories. Follow up project to Driver

  • OpenDOAR
    Directory of over 5,600 Open Access Repositories

  • Oxfam Publications
    Over 4,000 resources, mostly on development issues

  • OTA: Oxford Text Archive
    Over 2,700 resources, mostly arts and humanities

  • ParaCite: Eprints Eprints.org at Southampton serving Open Archives

  • PLOS: Public Library of Science
    Making scientific literature freely accessible to the public – 8 open access journals

  • Project MUSE (various American University Presses)
    Scholarly journals online

  • PubMed Central (NCBI)
    Over 8,000 open access journals (often with embargoes)

  • PubMed Central Europe
    European mirror site of PubMed Central

  • Répertoire des journaux électroniques francophones en médecine-sciences (CISMEF)
    Links to French periodicals (mostly not open access)

  • ROAR
    Registry of over 4,700 Open Access Repositories

  • SCIELO: Scientific Electronic Library Online (BIREME)
    Portal with over 1,800 Latin American open access journals, over 750,000 articles

  • ScienceOpen.com
    Research+publishing network

  • SSRN: Social Science Research Network
    Access to over 950,000 papers

  • TMCA: TropMed Central Antwerp (ITM)
    Open access repository of the Antwerp Institute of Tropical Medicine

  • Zenodo
    Shared research in Europe