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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4 tools
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OpenStreetMap
OpenStreetMap Foundation · GIS & mapping
Collaboratively edited world map database released under the ODbL, with planet files, an editing API and derived tiles and extracts
ODbL-1.0FreeSelf-hostedNov 2, 2026
Overpass API
Roland Olbricht and the OpenStreetMap community · GIS & mapping
Read-only query service for OpenStreetMap data using the Overpass QL language, available on public instances or self-hosted
AGPL-3.0-onlyFreeOpen sourceSelf-hostedNov 2, 2026
Zenodo
CERN (with OpenAIRE) · Research dissemination
Free general-purpose research repository operated by CERN that assigns DOIs to datasets, software, papers and other outputs, with a REST API, OAI-PMH, GitHub release archiving and CC0 metadata
Open sourceFreeNov 2, 2026
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