TSMV is an extension of NuSMV, the open-source symbolic model checker, aimed at dealing with timed versions of (models of) circuits, PLC controllers, protocols, etc. The underlying model is an extension of Kripke structures, where every transition carries an integer duration (possibly zero). This simple model supports efficient symbolic algorithms for RTCTL formulae.
Citation:
Nicolas Markey, Philippe Schnoebelen, "TSMV: A Symbolic Model Checker for Quantitative Analysis of Systems," qest, pp.330-331, The Quantitative Evaluation of Systems, First International Conference on (QEST'04), 2004