db4o :: Native Java & .NET Object Database :: Open Source db4o is an open source object database engine - a tool for software developers, designed to be as simple and fast as possible. It is supplied as a programming library (Java: .jar /.NET: .dll) to be included with developer applications. Db4o offers an open source object database engine designed to be as simple and fast as possible for software developers. By simply embedding db4o's open source object database engine into your application, you can store and retrieve even the most complex object structures with only one line of code. databasedb4oobjectopenorientedpersistencesource with bokmärkesfältsmappdatabasedb4ojavaobjectopenpersistencesourceby 2 users