nanomsg is described as 'socket library that provides several common communication patterns. It aims to make the networking layer fast, scalable, and easy to use. Implemented in C, it works on a wide range of operating systems with no further dependencies' and is an app in the Development category. There are five alternatives to nanomsg for Linux, Windows, Mac, Online / Web-based and BSD. The best alternative is RabbitMQ, which is both free and Open Source. Other great apps like nanomsg are ØMQ (Free, Open Source), ActiveMQ (Free, Open Source), NSQ (Free, Open Source) and Qutrunk (Free).
ØMQ is a high-performance asynchronous messaging library aimed at use in scalable distributed or concurrent applications. It provides a message queue, but unlike message-oriented middleware, a ØMQ system can run without a dedicated message broker.