As you seem to primarily target Linux, then the choice mostly depends on the programming language you want to use. If you code in C, then obviousl...

I've used GTK+, QT and wxWidgets before. Here's a brief summary: For my first cross platform UI project I decided to go for wxWidgets mainly becau...

I have never used GTK, but from my personal experience using Qt: It is much more than a simple GUI. It's a whole application framework. I used to...

It probably depends on what you want to do. I would recommend Qt, because it's more than GUI, it has nice Python bindings (so does Gtk), and GUI li...

Qt for one sure has solid DB, network, threading support etc... It does a lot more then just cross-platform GUI (and it does most of it quite well)...

Qt. It's not only object oriented, is "good" object oriented. It's based on a "subset" of C++ that doesn't rely on the obscurity of C++ (but you ar...

Just adding QT advantages to other answers.. QT has great documentation, its own IDE & GUI creator and enhances C++ with some new concepts like slo...

It also looks like Nokia is about to use Qt everywhere, like on Maemo.

If you want your app to run on iOS, Android, Blackberry, other mobile platforms, Windows, Mac OSX, and Linux, use Qt. qt-project.org.