- cancan 6,097 Authorization Gem for Ruby on Rails.
- ruby-warrior 3,248 Game written in Ruby for learning Ruby and artificial intelligence.
- letter_opener 2,317 Preview mail in the browser instead of sending.
- nifty-generators 2,053 A collection of useful Rails generator scripts.
- dotfiles 1,960 config files for zsh, bash, completions, gem, git, irb, rails