- cancan 6,087 Authorization Gem for Ruby on Rails.
- ruby-warrior 3,164 Game written in Ruby for learning Ruby and artificial intelligence.
- letter_opener 2,293 Preview mail in the browser instead of sending.
- nifty-generators 2,052 A collection of useful Rails generator scripts.
- dotfiles 1,956 config files for zsh, bash, completions, gem, git, irb, rails