React on Rails with Test Suite (Karma, Jasmine, Enzyme, PhantomJS) https://gist.github.com/andrewprogers/65f0228c262fbe8e1efe767527540aec
Patterns for Successful Rails Engines https://medium.com/ruby-on-rails/patterns-for-successful-rails-engines-a7dae3db6921
OAuth as Single Sign On https://blog.heroku.com/oauth-sso
Single Sign On (SSO) for Multiple Applications with Devise, OmniAuth and Custom OAuth2 Implementation in Rails http://codetheory.in/rails-devise-omniauth-sso/ https://blog.joshsoftware.com/2010/12/16/multiple-applications-with-devise-omniauth-and-single-sign-on/
A Guide to Rails Engines in the Wild: Real World Examples of Rails Engines in Action https://www.toptal.com/ruby-on-rails/rails-engines-in-the-wild-real-world-examples-of-rails-engines-in-action
Rails 4 Engines http://tech.taskrabbit.com/blog/2014/02/11/rails-4-engines/ https://github.com/taskrabbit/rails_engines_example
Upworthy on Engines: Evolution of a Multi-App Architecture http://upworthy.github.io/2015/11/upworthy-on-engines/
Building the Perfect Rails 5 API Only App https://ntam.me/building-the-perfect-rails-5-api-only-app/
Uploading files directly to S3 using Pre-signed POST request https://blog.bigbinary.com/2018/09/04/uploading-files-directly-to-s3-using-pre-signed-post-request.html
Docker for an Existing Rails Application http://chrisstump.online/2016/02/20/docker-existing-rails-application/
Discourse Links https://meta.discourse.org/t/official-single-sign-on-for-discourse-sso/13045