This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# OpenSSL::BNError < OpenSSL::OpenSSLError (from ruby core) --- Generic Error for all of OpenSSL::BN (big num) ---
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.