dBASE PLUS 10 - Object-Oriented Databases
MySQL - The world's most popular open source database
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PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
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).
Microsoft SQL - Microsoft SQL is a best in class relational database management software that facilitates the database server to provide you a primary function to store and retrieve data.