This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# OpenSSL::Netscape::SPKIError < OpenSSL::OpenSSLError (from ruby core) --- Generic Exception class that is raised if an error occurs during an operation on an instance of OpenSSL::Netscape::SPKI. ---
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.