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Datomic - The fully transactional, cloud-ready, distributed database
OrientDB - OrientDB - The World's First Distributed Multi-Model NoSQL Database with a Graph Database Engine.
Datahike - A durable datalog database adaptable for distribution.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Google Cloud Datastore - Cloud Datastore is a NoSQL database for your web and mobile applications.
ArangoDB - A distributed open-source database with a flexible data model for documents, graphs, and key-values.