MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
ObjectBox - ObjectBox empower edge computing with an edge device database and synchronization solution for Mobile & IoT. Store and sync data from edge to cloud.
Microsoft SQL Server Compact - Bring Microsoft SQL Server 2017 to the platform of your choice. Use SQL Server 2017 on Windows, Linux, and Docker containers.
HSQLDB - hsqldb: Full-featured 100% Java ORDBMS
Clustrix - Clustrix is the leading scale-out SQL database engineered for the cloud.
FerretDB - FerretDB is an open-source proxy, which is an alternative to MongoDB.