Gruff Graphs is a library for making beautiful graphs.
gruff gem is the Gruff graphing library for Ruby
You can install it as a gem:
gem install gruff
or add it into a Gemfile (Bundler):
Gruff uses Roboto font as default font which is licensed under the Apache License, Version 2.0.
You can find many examples in the test - https://github.com/topfunky/gruff/tree/master/test directory along with their resulting charts in the expected - https://github.com/topfunky/gruff/tree/master/test/expected directory.