Qt is a cross-platform application development framework widely used for graphical programs (GUI) and also for non-GUI tools.
Qt was developed by Trolltech (now owned by Nokia), and it's probably best known for being the foundation of the K Desktop Environment (KDE) for Linux.
The Qt toolkit is a collection of classes made to simplify the creation of programs. Qt is more than just a GUI toolkit. It includes components for abstractions of network sockets, threads, Unicode, regular expressions, SQL databases, SVG, OpenGL, and XML. It also has a fully functional web browser, help system, multimedia framework, and rich collection of GUI widgets.
Qt is available on several platforms, particularly Unix/Linux, Windows, macOS X, and also some embedded devices. As it uses native APIs of the platform to render the Qt controls, applications developed...