- redmine 56 Redmine on Rails 3 on Ruby 1.9!
- statsd-ruby 45 A Ruby client for StatsD
- rack-ratelimit 28 Flexible rate limiting for your Rack apps
- rack-reproxy 19 Transparently proxy Rack responses from a backend URL. Great for private access to an internal service or to route authenticated requests through intermediate caching layers.
- arel 7 A Relational Algebra