PolePosition
- An open source Java database benchmark framework and results. [Open source, GPL]
- http://polepos.sourceforge.net/

Java Database Tools, Products and Resources
- Extensive list of utilities for OO, OR and relational database application development in Java.
- http://www.javaskyline.com/database.html

The Apache DB Project
- Project charged with the creation and maintenance of commercial-quality, open-source, database solutions. Mailing list signup, guidelines, repositories, and proposals.
- http://db.apache.org/

CrossDB
- An open source Java API for writing object oriented SQL statements that will run on any database. [Open source]
- http://www.crossdb.com/