It seems like there is always a mix of 2 worlds: messaging and queuing, which are not the same job. Does a proper "queing" project, that is messaging independa

It seems like there is always a mix of 2 worlds: messaging and queuing, which are not the same job. Does a proper "queing" project, that is messaging independant exists ? That would open the door to a standardization of the queing semantics and API. Like, if I want to use crossbar.io (with it's WAMP protocol) for the messaging part, but need task queue, what are my options ?