OpenAlex
OurResearch · Literature discovery & review
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
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Overleaf
Overleaf (Digital Science) · LaTeX & typesetting
Collaborative online LaTeX editor with real-time co-editing, templates and reference-manager sync, available as a hosted service and an AGPL self-hosted edition
AGPL-3.0-onlyFreemiumPaidSelf-hostedNov 2, 2026
Zotero
Corporation for Digital Scholarship · Citation management
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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