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Druid is a GUI tool for database build and management. Users can add/change/delete DB objects (tables, fields, etc). Druid generates for you: SQL scripts, docs in XHTML, PDF, DocBook, etc; code in C, C++ & Java Beans even for JDO and support Castor & OJB
Gaea allows you to view/modify Object Databases with JDO standard. Operations on instances and class structures on the fly. A nigh-complete OQL library is embedded in the project and can easily be used by third-party software to attain OQL compatibility
Middlegen is a free general-purpose database-driven code generation engine based on JDBC, Velocity, Ant and XDoclet. If you already have a database, you can use Middlegen to generate EJB (CMP 2.0), Hibernate, JDO and JSP/Struts source code.
The JDO Learning Tools demonstrate the behavior of Sun's Java Data Objects (JDO). Explore the query language and the persistence manager. Contains prototypes for client/server, web, and EJB architectures. Works with several JDO implementations.
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This project is no longer being pursued. There are several JDO impls undergoing development including OJB, XORM, TJDO, etc. Give them a try!
Sparrow is a high performance transparent persistence service (aka. Object Database) implementing the Java Dat