Jdo

db4o 4.0
db4o (database for objects) is the open source object database for Java and .NET. It is free software available under the GPL and also under a commercial license. It can persist any native object with a single line of code and allows you to experience true object-orientation. Features include: ACID transactions, query-by-example, S.O.D.A. query API and automatic class schema recognition, small footprint.
db4o, database, objects, object, oo, .net, dotnet, c#, csharp, mono,

ObjectDB for Java/JDO - Free Edition 1.00
ObjectDB for Java/JDO is a powerful yet compact Object Database (ODBMS) for Java, compliant with the Java Data Objects (JDO) standard developed by Sun. A Free Download is available for non commercial use.
jdo, java data objects, java, database, object database, free database, oodbms, odms, object, persistence,

db4o for Java 5.5
db4o (database for objects) is the open source object database, native to Java. Free software, available under the GPL and under a commercial license. Persist any object with one line of code. Other features are object-oriented replication, Native Queries, automatic schema recognition, 400K footprint. Ideal for embedded use, e.g., in software running on mobile or medical devices, in packaged software, and for real-time systems.
db4o, database, objects, object, oo, java, free, opensource, pojo, wireless,