Segundo o wikipedia: Ruby é uma linguagem de programação interpretada, com tipagem dinâmica e forte, orientada a objetos com vastas semelhanças com Perl, SmallTalk e Python. Projetada tanto para a programação em grande escala quanto para codificação rápida, tem um suporte a orientação a objetos simples e prático. A linguagem foi criada pelo japonês Yukihiro Matsumoto, que aproveitou as melhores idéias das outras linguagens da época.

Aqui temos uma lista com os melhores sites internacionais sobre Ruby. São artigos, tutoriais, manuais e tudo que você precisa para aprender mais.

Instalação

• Ruby
• Ruby One-Click Installer
• RubyGems
• Ruby on Rails
• Instant Rails
• Locomotive
• How-tos Installation
• Fear of Fish: Getting Started
• Building Ruby, Rails, LightTPD and MySQL on Tiger
• GettingStartedWithRails

Tutoriais

• Try Ruby!
• Ruby User’s Guide
• Learning Ruby
• Hackety Hack: the Coder’s Starter Kit
• Tutorial
• Using Ruby on Rails for Web Development on Mac OS X
• Learn Ruby on Rails: the Ultimate Beginner’s Tutorial
• A Many-to-Many tutorial for Rails
• Getting Your Feet Wet With Ruby on Rails
• Beginners Guide to Rails, part 1
• Really Getting Started in Rails
• Basedex: Ruby on Rails
• How-tos
• 19 Rails Tricks Most Rails Coders Don’t Know
• Railscasts
• Ajax on Rails
• How to paginate, sort and search a table with Ajax and Rails
• Ruby on Rails Caching Tutorial
• How-to: Build a secured web application with Ruby on Rails
• A complete turbogears spoliation: how-to build a wiki in 20 minutes (well I did not time it)
• Agile RSS Aggregator in Ruby

Livros

• Programming Ruby: The Pragmatic Programmer’s Guide
• Why’s (poignant) guide to Ruby
• Learn to Program
• Ruby on Rails Books

Blogs

• Web 2.0 with Ruby on Rails
• Rails Envy
• The Rails Way
• Ruby Inside
• Ruby Underground
• Ruby on Rails Security Blog
• Web On Rails
• Riding Rails
• Ruby On Rails Blog

Fóruns

• Ruby Forum: Ruby on Rails
• Rails Forum
• TextDrive Community Forum/RubyOnRails
• #rubyonrails

Cheatsheet

• RubyOnRails-Cheetsheet
• InVisible Ruby On Rails Reference
• Ruby on Rails Cheat Sheet Collectors Edition
• Ruby Cheatsheet
• Ruby QuickRef

API

• RDoc Documentation
• Ruby Standard Library Documentation
• Rails Framework Documentation
• Ruby on Rails Manual

Outros

• DZone Snippets: Rails
• Ruby Forge Snippets
• RubyForge
• RubyRoll
• Plugins in Ruby on Rails
• Agile Web Development Plugins
• Ten Reasons Ruby Is Cool (Part 2.)
• Ruby From Other Languages
• Working With Rails
• HappyCodr