Open source Java Object Database Management System (ODBMS), with multi-user support, object-level access rights, deadlock detection, and XML/DOM support. [Open Source, GPL/LGPL]

Object database in Java for Java. [Free for non-commercial]

100% pure Java Object Oriented Database, with a simple API and no schema definition language. [Commercial]

A pure Java object database (ODBMS) component embedded into Java applications to provide object persistence. The j2 OODB is compliant with JDO and is designed for use in embedded systems.

A full featured Object Database for Java, written entirely in Java. JDO compliant. [Free for non-commercial]

Pure object DBMS written entirely in Java. Multi-user with client-server support and garbage collection. [Commercial]

A database and Web Services (SDK), includes documentation, example code and information about the author.

Presents an open source object-oriented database project with downloads, help, forum, FAQs, links and license information.

An object store implemented in Java. [Open Source, BSD style]

Alpha-quality object-oriented database providing ODMG-conforming Java and C++ language bindings, for Windows and Linux. [Free for personal use]