[richardknop]

Machinery is basically a Go implementation of celery (popular Python task queue).

It has two core components: broker (AMQP or Redis supported) and backend (Memcache, Redis or MongoDB or even no backend if you don't care about storing task states).

I think comparison with Sandglass would not be valid as Machinery is a higher level job/task queue while Sandglass is a lower level library (basically a message queue such as RabbitMQ which would be just a component of Machinery).

Faktory vs Machinery could be compared as they are on more or less same level of abstraction.