Open access repositories of scholarly works, including preprint servers, citation databases, and full-text paper archives across scientific disciplines.
7sources
An open-access preprint server for physics, mathematics, computer science, quantitative biology, statistics, and more, holding over 2.5 million papers. You can pull the full archive in bulk from Amazon S3, or harvest the metadata through OAI-PMH, a standard protocol for sharing records between repositories.
An aggregator of open-access research papers that harvests from thousands of repositories and journals worldwide. It holds over 300 million metadata records and more than 40 million full-text articles, all reachable through one search API.
A nonprofit DOI registration agency that publishes metadata for over 150 million scholarly works, including journal articles, books, and conference proceedings. A DOI is the permanent identifier assigned to each work, and Crossref shares its metadata through a free API.
A free, open catalogue of the world's scholarly works, authors, venues, institutions, and research topics. It succeeds Microsoft Academic Graph and holds hundreds of millions of works with rich metadata and citation links.
The US National Library of Medicine's database of biomedical and life sciences literature. PubMed indexes over 36 million citations and abstracts, and PubMed Central (PMC) adds free full-text access to a growing subset. You can download the data in bulk over FTP.
Allen AI's academic graph, covering hundreds of millions of papers linked by billions of citations. S2ORC, the Semantic Scholar Open Research Corpus, is the downloadable dataset with full text and parsed references, drawn from arXiv, PubMed, Crossref, publishers, and web crawlers.
A database that tracks where scholarly articles can be read legally for free, covering over 30 million open-access papers. Maintained by the nonprofit OurResearch, it links each article's DOI to full-text versions hosted across repositories and journals.