rubyzip

rubyzip is a ruby module for reading and writing zip files

$gem install rubyzip

Official docs outline

Extra Credit builds an outline of rubyzip's docs the first time your work uses it. Until then, start at the official documentation.

rexml An XML toolkit for Ruby
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actionpack Web apps on Rails. Simple, battle-tested conventions for building and testing MVC web applications. Works with any Rack-compatible server.
jwt A pure ruby implementation of the RFC 7519 OAuth JSON Web Token (JWT) standard.
rack-test Rack::Test is a small, simple testing API for Rack apps. It can be used on its own or as a reusable starting point for Web frameworks and te
ast A library for working with Abstract Syntax Trees.
railties Rails internals: application bootup, plugins, generators, and rake tasks.
actionview Simple, battle-tested conventions and helpers for building web pages.
actionmailer Email on Rails. Compose, deliver, and test emails using the familiar controller/view pattern. First-class support for multipart email and at
method_source retrieve the sourcecode for a method
mail A really Ruby Mail handler.
faraday-net_http Faraday adapter for Net::HTTP