13 - Tools
Here are some tools to help you automatically check Ruby code against this guide.
RuboCop
RuboCop is a Ruby code style checker based on this style guide. RuboCop already covers a significant portion of the Guide, supports both MRI 1.9 and MRI 2.0 and has good Emacs integration.
RubyMine
RubyMine's code inspections are partially based on this guide.