A library implementation of the Scheme language plus various convenient facilities. It's designed so that you can link it into an application or utility to make it extensible.

Object-oriented extension to Guile; very close in spirit to Common Lisp Object System, CLOS (CLtL2), but adapted for Scheme language; gives full OO system with multiple inheritance, generic functions with multi-method dispatch.

Guile bindings for Gtk+.

Maillist for general discussions about the guile-gtk project.