RubyGems is a native ruby package manager for Ruby libraries and Ruby applications.  Similar to apt-get, yum, emerge etc. but for Ruby apps only. It is packaged for debian/ubuntu (rubygems), but apt-get is still the recommended installation method for most ruby packages. See:
 * [[http://wiki.debian.org/Teams/Ruby/RubyExtras/OnRubygems|Debian Position on RubyGems]]
 * [[http://docs.rubygems.org/]]