Datahike - A durable datalog database adaptable for distribution.
Matisse - Matisse is a post-relational SQL database.
Oracle TimesTen - TimesTen is an in-memory, relational database management system with persistence and...
Datomic - The fully transactional, cloud-ready, distributed database
Valentina Server - Valentina Server is 3 in 1: Valentina DB Server / SQLite Server / Report Server
MarkLogic Server - MarkLogic Server is a multi-model database that has both NoSQL and trusted enterprise data management capabilities.