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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

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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