AMS - queue-based dispatching
AMS is a fairly simple layer on top of any sort of queue daemon. AMS takes care of serializing and deserializing jobs from a queue, and also wraps some other parts of the queue system (such as running the actual jobs so that they may be marked as done, or as failed.)
AMS can in theory be used with any queue daemon, however, for the time being only beanstalkd is supported.