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

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

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

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/