Db4o

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Db4o

Developer(s)	Actian
Stable release	8.0
Written in	C#, Java
Operating system	Cross-platform
Type	Object database
License	GNU General Public License (GPL) db4o Opensource Compatibility License (dOCL) Proprietary license

db4o (database for objects) was an embeddable open-source object database for Java and .NET developers. It was developed, commercially licensed and supported by Actian. In October 2014, Actian declined to continue to actively pursue and promote the commercial db4o product offering for new customers.^[1]