Eprint archives

arXiv (pronounced as "archive"—the X represents the Greek letter chi ⟨χ⟩) is an open-access repository of electronic preprints and postprints (known as e-prints) approved for posting after moderation, but not peer reviewed. It consists of scientific papers in the fields of mathematics, physics, astronomy, electrical engineering, computer science, quantitative biology, statistics, mathematical finance, and economics, which can be accessed online. In many fields of mathematics and physics, almost all scientific papers are self-archived on the arXiv repository before publication in a peer-reviewe

open access eLibrary; part of Elsevier

CiteSeerX (often stylized as CiteSeer; formerly called CiteSeer) was a public search engine and digital library for scientific and academic papers, primarily in the fields of computer and information science.

bioRxiv (pronounced "bio-archive") is an open access preprint repository for the biological sciences co-founded by John Inglis and Richard Sever in November 2013. It was hosted by Cold Spring Harbor Laboratory (CSHL) until March 11, 2025, when ownership transferred to the newly formed non-profit openRxiv, dedicated to bioRxiv and medRxiv.

bibliographic database for economics

medRxiv (pronounced "med-archive") is an online disciplinary repository publishing preprints in all disciplines of the health sciences. It distributes papers in the areas of medicine and clinical research without charge to the reader.

French open access repository

viXra is an electronic e-print archive known for unorthodox and fringe science. It was set up by independent physicist Philip Gibbs as an alternative to the dominant arXiv service operated by Cornell University. Its name comes from arXiv spelled backwards.