ZeroMQ is a community of projects that has grown and evolved significantly in the last years. It was never threatened by Nanomsg, which we saw as an interesting

ZeroMQ is a community of projects that has grown and evolved significantly in the last years. It was never threatened by Nanomsg, which we saw as an interesting experiment, and potentially an engine for a pure C stack. We have pure Java, C#, C, and C++ stacks, and a new pure Go stack. Above that, you will see many language bindings, especially PyZMQ and CZMQ, each with a large community on top. CZMQ provides things like actors and CurveZMQ authentication, and has wrappings in many languages. I'm writing a Node.js one at the moment, and did a Java one a few weeks ago. Above that, we have Zyre, a clustering library that is somewhat like Nano's bus pattern, yet rather stronger. It was designed for flaky WiFi networks, and does not lose messages as long as a node reconnects within a reasonable time. And above that, we have a message broker, Malamute, which does pub-sub and workload distribution. All the C libraries have rich packaging (builds for every conceivable platform, and bindings in a growing number of languages), provided by zproject. So you can start a Malamute server (a CZMQ actor) from Python, or Node.js, trivially. We have run Malamute on a $25 OpenWRT router. This stack is small, efficient, and very alive.