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PileWorks provides the organizational structure for coordinating several different projects which approach some aspect of Pile Technology. PileWorks defines a set of interfaces and implements some basic infrastructure for Pile engines and agents.
The Network Security Response Framework (NSRF) allows for testing different computer security response engines and methodologies. It supports simulated and real: Intrusion Detection Systems (sensors), Attacks, and Responses.
kissme is a free (GPLed) Java Virtual Machine. It is being developed on GNU/Linux and can run consolejava applications. kissme is to be used with the GNU Classpath java class library. kissme also provides support for orthogonally persistent java.
Tomato is an experimental Java application development environment which aims to replace text-based Java programming with a point-and-click visual programming language. The prototype works sufficiently to help develop parts of itself.
Whatzit provides a system for using error and status conditions much more rich than the canonical 'zero means success, anything else is situational' mechanism. You can tell the severity of a condition and where it originated by looking at its value.