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Datahike - A durable datalog database adaptable for distribution.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Datomic - The fully transactional, cloud-ready, distributed database
SQLite - SQLite Home Page
Matisse - Matisse is a post-relational SQL database.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.