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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

Mendeley

Elsevier · Citation management

Free reference manager from Elsevier with a desktop and web app, PDF annotation, a Web Importer, groups and bundled cloud storage

ProprietaryFreeLocalNov 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

Zotero

Corporation for Digital Scholarship · Citation management

In-depth entry

Free, open-source reference manager with browser connectors, word-processor plugins, a PDF reader, group libraries and optional paid file storage

AGPL-3.0-onlyFreeOpen sourceLocalNov 2, 2026

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