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Search Open Access

Our selection of the leading and trusted sources to find OA content

Search engines geared to Open Access discovery

These search engines include Open Access content, or are built on OA infrastructure and enabled for filtering to OA articles and book chapters

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Google Scholar

To display the link to Cambridge University Libraries through which you can access full text, you first need to select "University of Cambridge - ejournals@cambridge" by searching for Cambridge in the "Library links" section of account settings on Google Scholar. Google Scholar has much that is full text and available to anyone - indicated by the [DOC], [PDF], or [HTML] on the results list. Click on All versions under an article citation which may show a full text freely available version also.


"The world’s largest collection of open access research papers"


The Bielefeld Academic Search Engine, one of largest academic search engines, contains about 60% open access content


An Abstracting, Indexing and Analytics (AI&A) system for research papers published in peer-reviewed journals, designed around a link-resolver, oaFindr, which specifically locates free versions of articles


Contains more than 100 million publications, ranging from articles published in scholarly journals, books and book chapters, to preprints and conference proceedings. All publications are contextualized with linked data sets, funding, publications, patents, clinical trials, and policy documents. You can also view associated categories, funders, institutions, and researcher profiles.

Open Access publishers and directories

Select the OA platforms most relevant for your subject area and catalogues to search exclusively for OA publications

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BioMed Central

Open access journals in biomedicine, physical sciences, mathematics and engineering.

Directory of Open Access Journals (DOAJ)

Ca. 12,000 open access, peer-reviewed journals in all areas of science, technology, medicine, social science and humanities.

A search tool to find free articles and books, "focusses your search through a hand-crafted and curated index". Particularly good for the arts and humanities, but now including also journals in science, biomedical, business and law. A directory of the 4,000+ journals included is here and a new search tool for academic repositories, GRAFT, Global Repository Access Full-Text


A catalogue of millions of records that represent open access resources, formed by the harvesting from open access collections worldwide, including more than 50 million records

Open Library of the Humanities

An open access platform supporting academic journals from across the humanities disciplines.

Open Book Publishers

Open access ebooks. For more Open access ebook collections see the Cambridge Libraries Ebooks LibGuide

PLOS: Public Library of Science

Open access journals in medicine, technology and engineering

Open Access repositories and preprint servers

Find the OA repository most appropriate for you from among subject and institutional repositories 

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Directory of Open Access Repositories

OpenDOAR is the quality-assured global directory of academic open access repositories, enabling identification, browsing and search for repositories, based on a range of features, such as location, software or type of material held

Digital Commons Network

Open access full-text scholarly articles curated by university librarians

OSF preprints

Combines search results from a variety of preprint providers such as arXiv, bioRxiv, PeerJ, CogPrints. A million+ preprints are indexed and can be searched by author or keywords, or filtered by subject, preprint server, and most recent contributions.


Open access to 1,599,675 e-prints in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics


An online archive and distribution service for unpublished preprints in the life sciences


A preprint service for the psychological sciences


RePEc matches open access working papers in economics with their published (subscription and paywalled) article versions.


Self-archived and open access database of papers in any area of psychology, neuroscience, and linguistics, and many areas of computer science.


Social Science Research Network is an open-access online preprint community, specializing primarily in social sciences, including economics, law, corporate governance, and humanities

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