SQLite - SQLite Home Page
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.
dBASE PLUS 10 - Object-Oriented Databases
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).
Realm React Native - The fastest database for cross platform mobile apps