In vbscript it is common to use the browser (IE) as a GUI.
See the example below, it asks for a name and returns it to the script. In Ruby you have a few GUI\'s like Tcl and
Generally in Ruby people use something like Rails, Sinatra, or Camping to make web apps. Those all require gems. If you want something more similar to your VBscript example, without having to use gems, you can probably use Win32OLE (although I haven't tried it to open and interact with IE).