MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
NuoDB - A scale-out SQL database for global operations
Brilliant Database - Create a personal or business desktop database fast and easily using this simple all-in-one database software. Free 30 day trial.
CompactView - Viewer for Microsoft® SQL Server® CE database files (sdf)
CouchBase - Document-Oriented NoSQL Database
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.