db4o - Object database in Java for Java. [Free for non-commercial]
SOD - Alpha-quality object-oriented database providing ODMG-conforming Java and C++ language bindings, for Windows and Linux. [Free for personal use]
JYD Object Database - Pure object DBMS written entirely in Java. Multi-user with client-server support and garbage collection. [Commercial]
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'.
Jeevan - 100% pure Java Object Oriented Database, with a simple API and no schema definition language. [Commercial]
Sieben Geisslein - An object store implemented in Java. [Open Source, BSD style]
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.
ObjectStore - A complex data management and real-time event processing application for Java and C++ applications.
ObjectDB - A full featured Object Database for Java, written entirely in Java. JDO compliant. [Free for non-commercial]
MyOODB ( My Object-Oriented Database & Web Services ) - An database and Web Services (SDK), includes documentation, example code and information about the author.
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