It appears the EpidemicsRunner software toolkit has been made open source. It was developed by a crossfunctional team of the German Goethe Center for Scientific Computation Universität and has apparently been used in real life settings as guidance tool.
The EpidemicsRunner allows the user to run various algorithms used in epidemiologial modeling. The main feature is its in build editor and support an optimization framework, which allows the user to adjust model parameters to existing data.
It has been designed for ease of use (but still full of features) because its original purpose was as a quick response tool for e.g. local authorities. The vision: A non expert user can quickly generate various scenarios based on local data and decide local measures until expert knowledge arrives.
The tool has been used in various capacities. In order to inspire learning and maybe even help others, it has been made open source.
You can use and modify it however you want. You can also import only the headers to your own C++ program.
If you want to use the GUI, a build script is provided in the EpidemicsRunner folder. All features of the GUI are active if you put it in the plugin folder of the UG4 framework.