Qt is an application development framework developed by Trolltech and now owned by Nokia. I started using this framework about 6 months back and it has now become my choice for desktop application development. I find the framework very easy to use, and it makes application development very fast and efficient. The cross platform nature of the code only increases the power of Qt.
Being based on C++, speed is a very major factor, and thus Qt applications run very well on low end systems. So far, I have managed to develop a full fledged notepad application, and a marginally functional spreadsheet application. I have gained some experience into how desktop applications are developed. I am now planning to develop database applications using Qt, and also in the near future, port my applications to the Symbian, Maemo, Meego (and if possible…Android) platforms.