I have recently found out that the future of Qt has become uncertain as Nokia, It\'s current owner, has announced they officially have no interest in desktop Qt.
I know
There's the Fox toolkit, a cross-platform GUI C++ toolkit. I discovered it recently, and will be evaluating it for our software very soon. From the documentation, it seems pretty straight-forward, but I've not actually developed anything in it (yet.)
From the website:
FOX stands for Free Objects for X. It is a C++ based class library for building Graphical User Interfaces...Applications using FOX are not dependent directly on X-Windows. As all platform-dependencies are completely hidden from view by the FOX System (applications don't even include X-Windows header files!!), such applications will be easily ported to other platforms, simply by recompiling.