Flexoodb stands for Flexible Object Oriented Database API. Using your choice of RDBMS, Flexoodb represents objects as XML, allows proprietary Serializable objects to be embedded within the XML representation and manipulation using extended classes.
db4o is the world's leading open source object database for Java and .NET. Leverage fast native object persistence, ACID transactions, query-by-example, S.O.D.A object query API, automatic class schema evolution, small size (http://developer.db4o.com)
Gnumler is a "mapping framework". It is able to generate Hibernate xml mapping using a GUI, importing data from database or creating it via the embedded editor. It was born as a thesis project at Politecnico di Milano.
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