(I mean ActiveMQ et al overloading "message queue" in general, not you pipecat project)
[1] http://beej.us/guide/bgipc/output/html/singlepage/bgipc.html...
There are quite a few other message queue systems out there. I can also imagine that pipecat could work as a kind of migration systems between them. But this probably should be a separate tool as it requires shuffling around metadata as well.
Thanks.