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

Net::OpenTimeout

        # Net::OpenTimeout < Timeout::Error

(from ruby core)
---
OpenTimeout, a subclass of Timeout::Error, is raised if a connection
cannot be created within the open_timeout.
---

      

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.