InstantDB

InstantDB, a Java relational database management system.

InstantDB is the database has been adopted by thousands of Internet and database developers worldwide and has been distributed freely for use by non-profit and government organizations. It has also been available for purchase by for-profit companies, and currently ships with IBM's Websphere(TM) application server and other commercial applications. The current version is small, efficient, and easy to install; it also includes sample database functions to help the novice developer get started. InstantDB is accessed via its own JDBC(TM) driver, and utilization of standard SQL and Sun's JDBC API ensures that applications are highly portable.