This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Addrinfo.listen (from ruby core) --- listen(backlog=Socket::SOMAXCONN) { |sock| ... } --- creates a listening socket bound to self.
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.