https://lorenzosaino.github.io/publications/fnss-simutools13-slides.pdf
https://www.grotto-networking.com/DiscreteEventPython.html
Mature network simulation package aimed at researchers. Was thinking maybe could be used to simulation ptube or patient flow but seems so specific to computer networks that the additional complexity not worth it.
Still might be useful for learning how to architect a similar, simpler, simulation package for healthcare systems.
https://github.com/kentwait/nxsim
NetworkX + SimPy
Forked from ComplexNetworkSim (Python 2) https://pythonhosted.org/ComplexNetworkSim/introduction.html
This app has definite similarities to patient flow simulation. Docs address things like workflow and simulating multiple scenarios.