My typical Gemfile

Gemfile

source 'http://rubygems.org'

gem 'rails', '3.2.6'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

gem 'pg'
gem 'sqlite3', group: :test

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer', :platform => :ruby

  gem 'twitter-bootstrap-rails', github: 'seyhunak/twitter-bootstrap-rails'
  gem 'chosen-rails'

  gem 'uglifier', '>= 1.0.3'
end

# Views libraries
gem 'haml-rails'
gem 'jquery-rails'
gem 'simple_form'

# Authentication
gem 'devise'
gem 'omniauth'
gem 'omniauth-ldap'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# To use Jbuilder templates for JSON
# gem 'jbuilder'

# Use unicorn as the app server
gem 'unicorn'

# Deploy with Capistrano
gem 'capistrano'

# RVM
gem 'rvm-capistrano'

group :development do
  # To use debugger
  gem 'debugger'
  gem 'rails_best_practices'
  gem 'brakeman'
end

group :development, :test do
  # Test e-mailing
  gem 'letter_opener'

  #Guard
  gem 'guard'
  gem 'guard-rspec'
  gem 'guard-spork'
  gem 'guard-bundler'
  gem 'guard-livereload'
  gem 'guard-unicorn'
  gem 'guard-rails_best_practices', github: 'kugaevsky/guard-rails_best_practices'
  gem 'rb-fsevent'
  gem 'growl'
end

group :test do
  gem 'rspec-rails'
  gem 'factory_girl_rails'
  gem 'spork'
  gem 'ffaker'
  gem 'capybara'
  gem 'cucumber'
  gem 'rspec-expectations'
  gem 'database_cleaner'
end