FXRuby is a library for developing powerful and sophisticated cross-platform graphical user interfaces (GUIs) for your Ruby applications.

It’s based on the FOX Toolkit, a popular open source C++ library developed by Jeroen van der Zijp.

What that means for you as an application developer is that you’re able to write code in the Ruby programming language that you already know and love, while at the same time taking advantage of the performance and functionality of a featureful, highly optimized C++ toolkit.

• Category: GUI
• HomePage: FxRuby

Very complete bindings to both the KDE API and the Qt APIs. The Korundum package includes both a QtRuby Qt-only binding along with the full combined Qt/KDE one. The QtRuby package contains just Qt bindings with no dependencies on KDE.

Monkeybars is a library that enables you to make use of Swing from JRuby.

Monkeybars aims to allow you to continue using the GUI editing tools you are used to but makes it easy to write all your application logic in pure Ruby.

In fact, with most editors you’ll never even have to look at the Java.

• Category: GUI
• HomePage: Monkeybars

wxRuby is an open source GUI toolkit for the Ruby programming language. It allows native-looking desktop applications to be written for Windows, OS X, Linux GTK and other platforms using only Ruby. It's based on the cross-platform [wxWidgets] C++ GUI framework.