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.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
UnQLite - UnQLite is a in-process software library which implements a self-contained, serverless...
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
VoltDB - In-memory relational DBMS capable of supporting millions of database operations per second
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.