Facts and features
There were one million downloads of Qt 5.3 in just over a month after its launch.
There are 250+ commits by over 60 contributors per week. Companies that use Qt include AMD, Autodesk, Siemens, Panasonic, etc.
Alongside the support for traditional desktop user interfaces, Qt includes support for declarative UI development with Qt Quick. Widgets can be used for painting, printing and rendering. Integration between Qt and WebKit makes it possible for developers to use a fully-featured Web browser engine. The Qt framework is simple and user-friendly. Once you understand how this simple app works, you can start adding some more bells and whistles like signal/slot connections.