Here are comparisons between available toolkits.
--ruby-gtk2
The most complete and stable toolkit you'll find with the better ruby bindings
UTF8 support
API finished
very complete documentation
works on windows, unix, and mac
GUI designer available, Glade2 (link below shows link to glade for windows)
http://ruby-gnome2.sourceforge.jp/hiki.cgi?Install+Guide+for+Windows
--qtruby
works very well, stable API, complete..
unfortunately qtruby/4 is not on windows yet.
UTF8 support
very complete documentation
GUI designer available, qt designer
Native widgets on each platform
no windows install doc
--wxruby2
bindings not complete to ruby, missing classes and methods
works if you want to use just the basic widgets
UTF8 support however
Native widgets on each platform
--fxruby
well..
Its a okay toolkit if you use what fxruby stable is
lacks UTF8 support
the API is not stable, things change often. not fxruby's fault, its a FOX
toolkit development problem.
draws its own widgets
fox doesn't contain all the widgets other toolkits have like gtk
--tk
very complete, comlplete APIs, everything
bindings are included with ruby, but I don't think the curt's ruby installer
has the tk runtime.
You might want to consider ruby-gtk2, its pretty straight forward and simple.
qtruby/4 is almost there.
Tsume