Qu - Background job queue for Ruby, Redis, and MongoDB

Qu is interesting project for doing background jobs in Ruby from Brandon Keepers, one of the maintainers of delayed_job :

class ProcessPresentation
  def self.perform(presentation_id)
    presentation = Presentation.find(presentation_id)
    presentation.process!
  end
end

job = Qu.enqueue ProcessPresentation, @presentation.id

Check out the README for usage and answers on why another Ruby queuing library.