Ozone
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]
url: ozone-db.org/
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CudenDB
Java Object Database. It have simple interface like: 'store', 'get', 'delete', and 'query'. BTree algorithm is used for storing and searching. Indexes to allow for fast search. Transactions: 'beginTransactions', 'endTransactions', 'commit', and 'rollback'.
url: www.geocities.com/cudendb/
db4o
Object database in Java for Java. [Free for non-commercial]
url: www.db4o.com/
FastObjects j2
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.
url: www.fastobjects.com/us/FastObjects_PandS_j2.asp
Jeevan
100% pure Java Object Oriented Database, with a simple API and no schema definition language. [Commercial]
url: www.w3apps.com/index.jsp
JYD Object Database
Pure object DBMS written entirely in Java. Multi-user with client-server support and garbage collection. [Commercial]
url: www.jyd.com/
ObjectStore
A complex data management and real-time event processing application for Java and C++ applications.
url: www.objectstore.net/
PJODe - ODBMS for Java
Small footprint ODBMS for Java, written in Java. Simple API and customizable query interface. [Free for non-commercial]
url: www.linxpda.com/
SOD
Alpha-quality object-oriented database providing ODMG-conforming Java and C++ language bindings, for Windows and Linux. [Free for personal use]
url: www.tneumann.de/sod/index.html
XL2
OODBMS that uses persistent references to scale Java Object Serialization. [Open Source, GPL]
url: www.xl2.net/