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Visual Tracer allows the user to watch and explore the trace of an executing application. It shows information about the main events as they occur, as well as about the existing instances and their historical values. Visual Tracer has a nice GUI that allows the user to set the status and the speed of the application execution. Visual Tracer handles both single- and multithreading applications.

Consider greenfoot as a combination between a framework for creating two-dimensional grid assignments in Java and an integrated development environment (class browser, editor, compiler, execution, etc.) suitable for novice programmers. While greenfoot supports the full Java language, it is especially useful for programming exercises that have a visual element. In greenfoot object visualisation and object interaction are the key elements. If you know BlueJ and a microworld framework (like Karel the Robot or the AP Marine Biology Case Study) consider greenfoot as the best from both: object interaction (BlueJ) and object visualisation (microworlds).

The aim of this project is to create an AspectJ library making it possible to enforce Java coding policies and to express some of the constraints and semantics of UML directly in the code, making it more expressive and allowing these constraints and semantics to be checked either at compile time or at runtime. The library currently supports semantics related to accessibility, design by contract, relations between objects and the nature of the state of objects.