sidekiq is described as 'Simple, efficient background processing for Ruby'. There are six alternatives to sidekiq for a variety of platforms, including Mac, Windows, Linux, Self-Hosted solutions and Ruby. The best alternative is Zenaton, which is free. Other great apps like sidekiq are Ralley (Freemium), Delayed::Job (Free, Open Source), Resque (Free, Open Source) and Celery: Distributed Task Queue (Free, Open Source).
Simple, robust message queue as a service, that requires absolutely no setup as it works over HTTPS! Simply prefix ANY https request with ralley.to/ and we’ll queue, and then forward the request with the exact same method/body/headers/parameters.
Database based asynchronous priority queue system -- Extracted from Shopify - collectiveidea/delayed_job Delayed::Job (or DJ) encapsulates the common pattern of asynchronously executing longer tasks in the background.