The Duine Framework allows one to develop prediction engines for recommender systems. It contains a set of prediction techniques, a way to combine these techniques and a profile manager. The framework has a plug-in architecture, allowing customization.
JDBC Tools is a proxy driver framework for monitoring Java database access. It has pre-built JDBC logger and SQL query planning modules, but can be extended through a simple API to perform other monitoring operations.
Watchdog is a Java performance monitoring and tuning framework. It is suitable for production environments allowing flexible auditing of performance data for later analysis by a comprehensive set of tools.