FastSTI is a framework for implementing agent-based models of sexually transmitted infection epidemics. It is designed to handle up to tens of millions of agents on a mid-range laptop. On a high performance computer it can run dozens of large simulations or thousands of small ones in parallel.
The output of the simulations is written to CSV files, which can be further processed in scripting languages like Python or R.
You can do sophisticated simulations without making any modifications to the code. But if you do wish to extend the framework, it is written in C. The framework has been designed with extensibility in mind.
FastSTI is developed and tested on GNU/Linux using the gcc compiler (and often the Clang compiler too). It uses two portable 3rd-party libraries: the GNU Scientific Library and GLib. The code adheres to the C11 standard and should compile on any standards-compliant modern C compiler.
The documentation is on Readthedocs. It explains how to download, install, test, and run FastSTI, as well as how to define simulations, and modify the code.
There's a web interface to a toy version of FastSTI on Simhub that you can play around with to get a feel for how it works. Here's a screenshot from Simhub:
