This is a simple dashboard used to display performance metrics at Absolute Performance. It's pretty versatile and could be used to report on pretty much anything with a name, a number, and a timestamp. Some of the technologies used include Sinatra, coffeescript, twitter's bootstrap toolkit, and d3.js.
The data is stored in the data/ folder. You can look at data/core_dashboard_data.json.example for the format. The json files in data/ need to be named [app_name]_dashboard_data.json.
To quickly set up and run (on port 9292)...
bundle bundle exec rackup