Thanks for your reply. I am working on the code for topmod most likely as part of my thesis. We are going to put it on sourceforge soon, but I would like to think about changing the UI toolkit. right now it uses FLTK, which is pretty limited and ugly. It's also extremely tedious to update and add features.

I can't rely on a windows only interface, as this original code for topmod was written for linux and sgi boxes, and we use mostly linux at our lab.

Do you know of any good toolkits that would be good for a 3d opengl app like topmod? I am looking into gtk and something called ghost, and a friend suggested that it would be better to use an interface like blender that is rendered in opengl.