This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

Gem::Ext::Builder 

        # Gem::Ext::Builder < Object

---
# Includes:
Gem::UserInteraction (from ruby core)

(from ruby core)
---
# Class methods:

    class_name
    make
    new
    run

# Instance methods:

    build_extensions

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.