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rake stats # => LOC per controllers, models, helpers; code ratios, and more
rake notes # => collects TODO, FIXME and other Tags from comments and displays them
rake about # (Rails 3+) => Rails, Ruby, Rake, Rack etc. versions, used middlewares, root dir, etc.

Growing Rails Applications in Practice

Check out our e-book. Learn to structure large Ruby on Rails codebases with the tools you already know and love.

Introduce design conventions for controllers and user-facing models
Create a system for growth
Build applications to last

Some nifty Rails Rake tasks

Growing Rails Applications in Practice