Shoes makes building little graphical programs for Mac, Windows, and Linux super simple
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DSL Framework consisting of a DSL Engine and a Data-Binding Library used in Glimmer DSL for SWT (JRuby Desktop Development GUI Framework), Glimmer DSL for Opal (Pure Ruby Web GUI), Glimmer DSL for LibUI (Prerequisite-Free Ruby Desktop Development GUI Library), Glimmer DSL for Tk (Ruby Tk Desktop Development GUI Library), Glimmer DSL for GTK (Ruby-GNOME Desktop Development GUI Library), Glimmer DSL for XML (& HTML), and Glimmer DSL for CSS
A set of bindings for the GNOME libraries to use from Ruby.
An easy to install gem version of the Ruby bindings to Qt
FXRuby is an extension module for Ruby that provides an interface to the FOX GUI toolkit.