RedDwarf is a horizontally scalable application server for low latency apps such as online games, virtual worlds, and social networking applications. It is the official community fork for Project Darkstar, previously sponsored by Sun Microsystems.
insideApps from determyne: Transaction-level performance monitoring for J2EE applications. Correlates and reports on transactions across HTTP server, J2EE container, and database layers. Pinpoints the source of performance issues in real time.