Simile is described as 'Multi-paradigm modelling and simulation software for complex dynamic
systems in the earth, environmental and life sciences. Logic-based declarative modelling represents the
interactions in these systems in a clearly structured, intuitive way' and is an app. There are more than 10 alternatives to Simile for Windows, Linux, Mac and Docker. The best Simile alternative is Anylogic. It's not free, so if you're looking for a free alternative, you could try MATSim or Simulation of Urban MObility (SUMO). Other great apps like Simile are FlexSim, Simio, TransModeler and SIMUL8.