ZeroMQ (also known as ØMQ, 0MQ, or zmq) looks like an embeddable networking library but acts like a concurrency framework.

 It gives you sockets that carry atomic messages across various transports like in-process, inter-process, TCP, and multicast. 

You can connect sockets N-to-N with patterns like fan-out, pub-sub, task distribution, and request-reply. 

It's fast enough to be the fabric for clustered products. Its asynchronous I/O model gives you scalable multicore applications, built as asynchronous message-processing tasks.

 It has a score of language APIs and runs on most operating systems.

https://docs.spring.io/spring-integration/reference/html/zeromq.html