ZeroMQ

ZeroMQ (also known as ØMQ, 0MQ, or zmq) is an open-source messaging library that looks like an embeddable networking library but acts like a concurrency framework. It provides sockets that carry atomic messages across transports including in-process, inter-process, TCP, and multicast, connectable N-to-N with patterns like fan-out, pub-sub, task distribution, and request-reply. Its asynchronous I/O model enables scalable multicore applications and it offers language APIs across most operating systems, with adopters including Microsoft, Samsung, Spotify, and Facebook.