Development Gems for Ruby on Rails

They add no functionality to the app itself, but they’re great for development:

group :development do
  gem 'annotate'
  gem 'better_errors'
  gem 'binding_of_caller'
  gem 'bullet'
  gem 'debugger'
  gem 'flay'
  gem 'hirb'
  gem 'localtunnel'
  gem 'lol_dba'
  gem 'mailcatcher'
  gem 'meta_request','0.2.1'
  gem 'pry'
  gem 'pry-doc'
  gem 'quiet_assets'
  gem 'rack-mini-profiler'
  gem 'railroady'
  gem 'rails-footnotes', '>= 3.7.5.rc4'
  gem 'rails_best_practices'
  gem 'reek'
  gem 'request-log-analyzer'
  gem 'smusher'
end

Also install Zeus to speed up application startup (do not add to Gemfile):

$ gem install zeus

Some gems above are not compatible with Ruby on Rails 4 yet.

From: Must Have Gems for Development Machine in Ruby on Rails

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