Datomic - The fully transactional, cloud-ready, distributed database
Oracle TimesTen - TimesTen is an in-memory, relational database management system with persistence and...
Google Cloud Datastore - Cloud Datastore is a NoSQL database for your web and mobile applications.
Valentina Server - Valentina Server is 3 in 1: Valentina DB Server / SQLite Server / Report Server
Datahike - A durable datalog database adaptable for distribution.
SAP MaxDB - The SAP MaxDB database (formerly SAP DB) is developed and supported by SAP AG.