Ruby GUI toolkits are typically 3rd party GUI platforms that are driven (wrapped) by a Ruby driver. Ruby bindings are available for several widget toolkits, among them Tk, Gtk, Fox, Qt, and SWT. QtRuby gives you Ruby bindings to the Qt toolkit (the toolkit used in the KDE desktop system). Advantages: Has a book. Has Qt designer for help designing. Gem is available for the Windows installation Disa