GUI with Ada?

["Nasser M. Abbasi" <nma@12000.org>]

Hello;

I have not kept up with Ada for sometime. I was wondering, if someone wants 
to develop a simple GUI (plots, menus, buttons, graphs, etc..) using Ada, 
and have the code compile to a .exe on windows and linux, which is the 
current most popular software pieces needed for the GUI?

Assuming I will be using GNAT. Which gcc version should I be using these 
days which has the latest Ada support in it? Should I be using gcc directly 
for Ada programming these days, or use GNAT GPL 2009 version from Libre web 
site http://libre.adacore.com/libre/ ?

I know there are few choices for the GUI, and just wanted to check what is 
the "best" choice do you think for that.  One with a GUI builder would be 
nice (i.e. where one can pick the components and lay them out to design the 
interface). This will be an school program, nothing commercial. I wanted to 
try to write some basic finite element code in Ada, but need a GUI part for 
the simulation part.

Thanks,
--Nasser