MGen is a set of tools for generating simulated messenger traffic. You can see the README for a full description, but the basic idea is, if you need to generate messenger network traffic for some kind of experiment, you can pass it in a distribution (analytical or empirical), and it will do that for you. It supports a client-server model and a peer-to-peer model (e.g., for use with onion services), both designed to be extremely efficient. Note that it's designed for simulating network traffic, and not, e.g., computational overhead or social network properties.