qt3: qt3 (multi-platform C++ graphical user interface toolkit, version 3) qt3: qt3: Qt is a complete and well-developed object-oriented framework for qt3: developing graphical user interface (GUI) applications using C++. qt3: qt3: This release is free only for development of free software for the X qt3: Window System. If you use Qt for developing commercial or other qt3: non-free software, you must have a professional license. qt3: qt3: qt3: