neo4j - Meet Neo4j: The graph database platform powering today's mission-critical enterprise applications, including artificial intelligence, fraud detection and recommendations.
dBASE PLUS 10 - Object-Oriented Databases
ArangoDB - A distributed open-source database with a flexible data model for documents, graphs, and key-values.
InterSystems Caché - Use InterSystems Caché advanced database for high-volume data. Learn more about how Caché analyzes unstructured data and handles transaction management.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
VelocityDB - VelocityDB is an easy to use, extremely high performance, scalable, embeddable and distributable object database system with indexes for C# .NET applications with a small footprint (~ 600KB).