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

binding 

        # Proc.binding

(from ruby core)
---
    prc.binding    -> binding

---

Returns the binding associated with *prc*.

    def fred(param)
      proc {}
    end

    b = fred(99)
    eval("param", b.binding)   #=> 99

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.