iUML is a multi-user application development environment that for Executable UML modelling, simulation and code generation. It provides support for the xUML formalism including an Action Language and support for model execution, test and debug. Full lifecycle support is provided through use case and textual requirements management and target code generation. In addition, there is built-in configuration management and open interfaces to support integration with third party products.
    iUML bundles three components:

• iUML Modeller : The multi-user modelling environment
• iUML Generator : Generates the code required for model execution
• iUML Simulator : The model execution, test and debug facilities

iUMLite is free for Windows 2000 and NT4.