GOOPS is the Guile Object-Oriented Programming System.
(GOOPS and its manual are also distributed as an integral part of the
core Guile distribution, and available via anonymous CVS as part of the
guile-core module.)
This is a tutorial by David Drysdale that explains step-by-step how to
use guile in a straightforward Logo-like ("turtle graphics")
application. He writes in the Colophon:
I wrote this page because I really needed something like it when I
started playing with Guile - I actually wrote the page as I figured out
how to do things.