Bad news. The server hosting The Ruby Toolbox went bust on the evening of June 7th. While I do have backups, the original source code is in a very outdated state so I currently don't feel it makes sense to try and get it running again.

For the time being, here is a very stripped down version of the Ruby Toolbox's contents.

Update June 13th: I'd like to invite you to join the discussion on the future of the Toolbox on github. You can also get in touch directly on Twitter.

Christoph
 Score 1.14

shoes

Shoes is the best little GUI toolkit for Ruby. This gem is currently a placeholder until we properly gemfiy Shoes.

 Rubygem shoes
 Github shoes/shoes
 Score 0.42

FXRuby

FXRuby is the Ruby binding to the FOX GUI toolkit.

 Rubygem fxruby
 Score 0.31

Ruby/GTK2

Ruby/GTK2 is a Ruby binding of GTK+-2.x.

 Rubygem gtk2
 Score 0.28

qtbindings

qtbindings provides ruby bindings to QT4.x. It is derived from the kdebindings project.

 Rubygem qtbindings
 Score 0.11

wxRuby

wxRuby allows the creation of graphical user interface (GUI) applications via the wxWidgets library. wxRuby provides native-style GUI windows, dialogs and controls on platforms including Windows, OS X and Linux.

 Rubygem wxruby
 Score 0.06

monkeybars

monkeybars

 Score 0.02

ffi-tk

Pure Ruby FFI wrapper for the Tk GUI toolkit.

 Rubygem ffi-tk
 Github manveru/ffi-tk