SWeeTgui
Download/Releases
http://rubyforge.org/frs/?group_id=2241&release_id=7008
Documentation
See http://sweetgui.rubyforge.org/doc
Installation
Use
gem install sweetgui --source http://gems.virtual-void.net
to install sweetgui. You may test it with jirb
B:\jruby-0.9.0\bin>jirb -r rubygems irb(main):001:0> require 'swt' => true irb(main):002:0> SWT::object_tree 'Test' => false irb(main):003:0> exit
Looks like this (you may look at the code for object_tree for some hints):

