The presence of ZeroMQ in the list of projects built with erlang also made me frown as well. But in the author's defence, there is a pure erlang implementation

The presence of ZeroMQ in the list of projects built with erlang also made me frown as well. But in the author's defence, there is a pure erlang implementation of zeromq [0] [0] https://github.com/zeromq/ezmq