Hi Burlen,
there is already an effort underway to port DDD to another widget set.
However, at present I am the only one working on it. Because I happen
to be familiar with Gtkmm and unfamiliar with Qt, I am aiming at Gtkmm
(I don't want to get into any toolkit wars here, I'm sure Qt would do
fine!). Gtkmm programs will also run on MS-Windows under a cygwin or
mingw environment.
However, my port is designed to work through an abstraction layer which
separates the DDD code from the the underlying toolkit. My code
implements the necessary widgets using Gtkmm, but you might find that an
additional Qt backend would be reasonably easy to write. The toolkits
do have plenty of conceptual similarities (signals/slots etc.).