SOD - Alpha-quality object-oriented database providing ODMG-conforming Java and C++ language bindings, for Windows and Linux. [Free for personal use] Sieben Geisslein - An object store implemented in Java. [Open Source, BSD style] 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 ) - A database and Web Services (SDK), includes documentation, example code and information about the author. JODB - Presents an open source object-oriented database project with downloads, help, forum, FAQs, links and license information. JalistoPlus - A lightweight, transactional database which is able to directly persist and query for Java object graphs is presented with news, download, forum, tutorial and roadmap.