Tuttle
Tuttle is a tool for assisting Rails developers by exposing runtime configuration information for your application. It is similar to the /rails/info/routes and /rails/info/properties information pages or the rake routes and rake middleware tasks.
Tuttle is very much in alpha/proof-of-concept mode. You can see it in action in a simple demo application. The source code for that demo is also on GitHub.
To use...
Add tuttle to you Gemfile
gem 'tuttle', :github => 'dgynn/tuttle', :branch => 'develop'
Browse to /tuttle