Paul99
Please just see, what for, you want to use your(new) software for.
Is it(s/w) basically for the simulation of a system where even a feel for the flow of power/current is shown on an interactive graphic diagram and then associated (simple)analyses? There are packages with the basic thrust as 'simulators'. Can be very well used for training, demo, understanding of the system: as a simulator. Say Eg Powerworld. These s/w have some other useful computing features as well..but normally are not having modules like 'stability'.
Is it for a thorough analysis of systems for you to produce outputs of computations(where it is more 'analyser' than 'simulator')? There are many examples, as already cited in earlier postings.
SS