How to: Data Visualization
* [Chartkick](http://chartkick.com/) - Create beautiful Javascript charts with one line of Ruby.
* [GeoPattern](https://github.com/jasonlong/geo_pattern) - Create beautiful generative geometric background images from a string.
* [LazyHighCharts](https://github.com/michelson/lazy_high_charts) - A simple and extremely flexible way to use HighCharts from ruby code. Tested on Ruby on Rails, Sinatra and Nanoc, but it should work with others too.
* [ApexCharts.rb](https://github.com/styd/apexcharts.rb) - Awesome charts for your ruby app. Works on any ruby app, including Rails app. It even works on plain HTML+ERB files.
* [RailRoady](https://github.com/preston/railroady) - Ruby on Rails 3/4 model and controller UML class diagram generator.
* [Rails Erd](https://github.com/voormedia/rails-erd) - Generate Entity-Relationship Diagrams for Rails applications.
* [Ruby/GraphViz](https://github.com/glejeune/Ruby-Graphviz) - Ruby interface to the GraphViz graphing tool.