This is a general purpose gem which adds functionality to the ruby language and defines some system tasks, such as generating a gem.
It is on RubyGems. Because there is an existing gem named gemmy, the name passed to gem install is gemmyrb. But require 'gemmy' is still used.
RubyGems hosts the YARD documentation at http://www.rubydoc.info/gems/gemmyrb, but it's only updated when I remember to run yard.
Follow the links from http://github.com/maxpleaner/gemmy, not rubydoc
- Loading the gem's code in different scopes
 - Shell commands and other one-off processes
 - Natural language utilities
 
To see a full list of the patched methods, see the rubydoc
Specifically, look at the constants defined on Gemmy::Patches. There is one module for each of the core classes being patched. Each individual method is also contained in its own module.
cool gems to include as dependencies
chainable_methods method_missing