This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Pathname.sysopen (from ruby core) --- pathname.sysopen([mode, [perm]]) -> fixnum --- See IO.sysopen.
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.