Building Qt based applications with Qt Creator
Qt is a very easy to use cross-platform application and UI framework, you can define application interface in xml and then interact with this interface using Qt facilities. Qt is the library behind the popular KDE Desktop Enviroment, it allows the developer to create rich desktop interfaces, now Qt has a IDE called Qt Creator, I could create a very simple app that can download some text from internet with few lines of code.
Qt Creator is part of Qt SDK and can be downloaded here.