The Wharton School, University of Pennsylvania · Market & fundamentals data
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Institution-subscribed research data platform from Wharton hosting CRSP, Compustat, TAQ, OptionMetrics and dozens of other vendors' databases with web queries, SQL, SAS, Python and R access
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