Guides

• Ruby style guide
• Rails style guide
• Ruby on Rails guides (no joke)
• Better Specs

Docks

• Apidock

News

• RubyFlow
• Ruby Weekly
• reddit for rubyists

Video & blogs

• Confreaks TV - Video from conferences

Gems

• Ruby Version Manager (RVM)
• Bundler - manage your app's dependencies
• Ruby Toolbox
• Awesome Ruby - A categorized community-driven collection of awesome Ruby libraries, tools, frameworks and software. The essential Ruby to build modern Apps and Web Apps.