Zmq-stdin is a project mainly written in CoffeeScript, it's free.
stdin -> zmq -> stdout
zsend - read from standard input and write to specified zmq endpoint
zrecv - read from specified zmq source and write to standard output
[STDIN] | zsend [req|push|pub] tcp://your-server-url:port
zrecv [rep|pull|sub] tcp://your-server-url:port [subscription topic] | [STDOUT]