How to: Scheduling
* [minicron](https://github.com/jamesrwhite/minicron) - A system to manage and monitor cron jobs.
* [que-scheduler](https://github.com/hlascelles/que-scheduler) - A lightweight cron scheduler for the async job worker Que.
* [resque-scheduler](https://github.com/resque/resque-scheduler) - A light-weight job scheduling system built on top of Resque.
* [rufus-scheduler](https://github.com/jmettraux/rufus-scheduler) - Job scheduler for Ruby (at, cron, in and every jobs).
* [ruby-clock](https://github.com/jjb/ruby-clock) - A job scheduler which runs jobs each in their own thread in a persistent process.
* [Sidekiq-Cron](https://github.com/ondrejbartas/sidekiq-cron) - A scheduling add-on for Sidekiq.
* [Simple Scheduler](https://github.com/simplymadeapps/simple_scheduler) - An enhancement for Heroku Scheduler + Sidekiq for scheduling jobs at specific times with a readable YML file.
* [Whenever](https://github.com/javan/whenever) - A Ruby gem that provides a clear syntax for writing and deploying cron jobs.