A rich text editor that isn't awful, over one thousand free programming books, handle email subscriptions and track emails sent, super easy email unsubscribe, and a cheatsheet for OAuth exploits.
Unary Operators, Writing fast Ruby, each_with_object, ES6 Transpiler and HStore
RailsRumble, Ruby Motion for Rails devs, how Ruby Hashes work, how to deal with data migrations, clean up your routes file, and get better logs.
Rails data migrations, tools for optimization, Bundler::Updater, using UUID with Postgres, 20,000 Leagues Under Active Record, and Ruby 2.2.0
Greenscreen.io, rails-disco, onboarding your junior devs, being a better Rubyist, staging environments, and the anti-pattern of absolutes all in this episode of the Ruby5.