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arXiv

arXiv (independent non-profit, formerly hosted by Cornell University) · Research dissemination

Free, moderated open-access preprint server for physics, mathematics, computer science, statistics, quantitative finance, economics and related fields, with an open API and bulk access

Open sourceFreeNov 2, 2026

Crossref

Crossref · Research dissemination

Membership organization that registers DOIs for scholarly content and exposes the metadata through a free public REST API, content negotiation and the paid Metadata Plus service

ProprietaryFreePaidNov 2, 2026

Google Scholar

Google (Chrome DevTools team) · Literature discovery & review

Free scholarly search engine from Google that indexes articles, theses, books and court opinions with citation counts and author profiles

ProprietaryFreeNov 2, 2026

OpenAlex

OurResearch · Literature discovery & review

In-depth entry

Open catalog of the global research system: works, authors, sources, institutions and topics under CC0, served by a REST API, web app and S3 snapshot

Open sourceFreeFreemiumBroken

RePEc

RePEc volunteers · Research dissemination

Volunteer-run decentralized bibliographic database of economics research, fed by institutional archives and served through IDEAS, EconPapers, the Author Service, CitEc, NEP and MPRA

MixedFreeNov 2, 2026

Semantic Scholar

Allen Institute for AI (Ai2) · Literature discovery & review

Free AI-assisted literature search from Ai2 with an Academic Graph API, recommendations and downloadable datasets of papers, authors and citations

ProprietaryFreeNov 2, 2026

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