This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Gem::Exception < RuntimeError (from ruby core) --- Base exception class for RubyGems. All exception raised by RubyGems are a subclass of this one. ---
This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.