Comment Perl + Gtk3, baby :) (Score -1) 281
I've been building open-source classes for Forms, Datasheets, and Reports for many years now. Check out my stuff on CPAN:
http://search.cpan.org/~dkasak...
I primarily use Gtk+ and Perl. The libraries on CPAN use Gtk2, but I've got Gtk3 ports ready to release now. The amazing advantage to moving to Gtk3 for me is the 'broadway' HTML5 backend.
Email me @ d.j.kasak.dk@gmail.com and I'd be happy to work with you on this.