From: Nomen Nescio on
Please use wxWidgets, the multiplatform C++ class library. It's free,
open-source and non-commercial. It's modeled after MFC but it produces
code which can be compiled (using conditional compilation) into native
code executables with the speed and UI look of the platform for which
the
compile is targeted. So the Windows executable looks like (and is) a
real
Windows program, the Mac OS X executable looks like (and is) a native
Mac
OS X program and the Linux executable is and looks like a real
Linux/GTK+
application. It has been in development by a band of open-source
programmers led by Julian Smart for over a decade (17 years to be
exact)!

So code in wxWidgets and your program will run on both Windows, Mac OS X
and Linux, natively. Three for the price of one! And it's much easier to
use than MFC. Dialogs and windows are easy to design using the
wxFormbuilder WYSIWYG UI creator (open source and free).
So prepare your software to be independent of platform yet still look
'native' and be prepared for the future.

See http://www.wxwidgets.org for more information.

(this has been a non-commercial presentation)