TryRuby  - Got 30 minutes? Give Ruby a shot right now!

Learn Ruby  - Continue your learning by starting with Learn Ruby

Learn Jekyll  - Introduction to the world of static site generators

Rails Guides  - Get started with creating a Rails application from scratch

Hanami 2.0  - Hanami is a Ruby framework designed to create software that is well-architected, maintainable and a pleasure to work on

Sinatra  - Sinatra is a DSL for quickly creating web applications in Ruby with minimal effort

DragonRuby Game Toolkit  - DragonRuby Game Toolkit (DRGTK) is a cross-platform professional grade game engine for building 2D games. It lets you write games in Ruby, a wonderfully expressive and approachable language

Master Ruby on Exercism  - Access to 108 exercises grouped into 17 Ruby Concepts, with automatic analysis of your code and personal mentoring, all 100% free

Ruby Warrior  - Game designed to teach the Ruby language and artificial intelligence in a fun, interactive way