1. The document discusses RubyGems, Bundler, and rbenv/ruby-build. It provides an overview of each tool's purpose and history. 2. RubyGems is the package manager for Ruby libraries. Bundler is a tool for managing dependencies of Ruby applications. Rbenv/ruby-build allow managing multiple Ruby versions and building Ruby. 3. The document outlines plans to further integrate RubyGems and Bundler, but notes Bundler 2 has not yet been released, which is needed for full integration. Security improvements have also been made to RubyGems.