Vensim
Vensim has become the software of choice for thousands of analysts, consultants and researchers worldwide to construct simulation models of business, scientific, environmental, and social systems.
Vensim integrates into one environment a powerful suite of tools for developing, testing, interpreting, and distributing models. These tools include cause-and-effect diagramming, graphical and textual model construction, easy reproduction of model structure using subscripts (arrays), Monte Carlo sensitivity analysis, optimization, data handling, and application interfaces. Further features enable advanced model resolution and fidelity. Vensim includes patented techniques to aid error detection, error prevention, and rapid comprehension of complex results.
(Source: http://www.ventanasystems.co.uk/services/software/vensim/)
This work was funded by a NERC Postgraduate and Professional Skills Development Award.