Resque

Introduction
Resque (pronounced like "rescue") is a Redis-backed library for creating
background jobs, placing those jobs on multiple queues, and processing
them later.
For the backstory, philosophy, and history of Resque's beginnings, please see the blog post (2009).
Background jobs can be any Ruby class or module that responds to
perform. Your existing classes can easily be converted to background
jobs or you can create new classes specifically to do work. Or, you
can do both.
Resque is heavily inspired by DelayedJob (which rocks) and comprises
three parts:
- A Ruby library for creating, querying, and processing jobs
- A Rake task for starting a worker which processes jobs
- A Sinatra app for monitoring queues, jobs, and workers.
Resque workers can be given multiple queues (a "queue list"),
distributed between multiple machines,
run anywhere with network access to the Redis server,