FSMSim is a software tool designed to teach finite state machines - Finite State Automata and Mealy Machines - for A Level Computing/Computer Science. It enables exploration of user-defined finite state machines constructed to recognise valid strings in the regular language expressed in the user-defined finite state machine. It runs on Windows 98, 2000, XP, Vista, 7, 8 and 10. Price quoted is without VAT. This product incurs VAT at 20%.