datasetsearch.research.google.com
Google Dataset Search helps find datasets from repositories, publishers, and research sources.
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ariadne2.isti.cnr.it
Dataset and resource search service for finding public data collections and research material.
github.com
GitHub awesome list collecting OSINT tools, datasets, training links, and research resources.
muckrock.com
MuckRock is a collaborative news site and nonprofit organization and newsroom that provides tools to hold government accountable. Users can file, track and share public records requests, and analyze, annotate and publish primary source documents. An initiative publishes government datasets of public interest, and a Sunlight Research Desk membership is offered to newsrooms.