DAETools is described as 'DAE Tools is equation-based object-oriented modelling, simulation and optimisation software. Its Hybrid approach to mathematical modelling lets you easily develop models of complex multiscale/multiphysics processes/phenomena' and is an app in the Education & Reference category. There are five alternatives to DAETools for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Chrome OS. The best alternative is SciPy & Numpy, which is both free and Open Source. Other great apps like DAETools are Xcos (Free, Open Source), OpenModelica (Free, Open Source), COMSOL Multiphysics (Paid) and StochSD (Free, Open Source).
StochSD (Stochastic System Dynamics) is a System Dynamics simulation software with focus on stochastics. It is a form of Continuous System Simulation (CSS) that in addition to model and simulate continuous flows between compartments, can handle transitions of discrete entities.