Hi!

On Sat, Jan 8, 2011 at 9:34 AM, Sascha Schneider <ungleichklang@gmail.com> wrote:
- gtkmm sits on top of gtk and the most designfiles are kinda "closed source" .o

What do you mean here?  From the gtkmm site:
gtkmm is free software distributed under the GNU Library General Public License (LGPL).

If by "designfiles" you mean files that represent the whole "User Interface", they're bog-standard
XML files. Check out http://glade.gnome.org/ for details.

-Harry