AWS Data Exchange
Marketplace for third-party datasets on AWS
AWS Data Exchange is a marketplace where providers list datasets and subscribers get them in their AWS account. It handles subscription, billing and delivery to S3 and other AWS services.
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Data.gov
Data marketplaces
US government open data portal
Databricks Marketplace
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Open marketplace built on Delta Sharing
Datarade
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Directory to compare and request data products
Hugging Face Datasets
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Datasets hub for machine learning
Kaggle Datasets
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Public datasets shared by the community
Nasdaq Data Link
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Financial and alternative datasets, formerly Quandl