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Datahike - A durable datalog database adaptable for distribution.
Schema API - Extract structured content from the semantic web
Valentina Server - Valentina Server is 3 in 1: Valentina DB Server / SQLite Server / Report Server
Microlink - Extract structured data from any website
Google Cloud Datastore - Cloud Datastore is a NoSQL database for your web and mobile applications.
PlanetScale - The last database you'll ever need. Go from idea to IPO.