Paid license providing access to extra tools, support, and the ability to close your source code completely.
Qt is a C++ framework—though it has excellent Python bindings (PySide) and a declarative language (QML)—used to build graphical interfaces. It abstracts away the complex, platform-specific API calls required to make windows, buttons, and graphics, allowing you to "Write Once, Compile Anywhere". Why Download Qt? download qt gui
Code once for Windows, Linux, and macOS. Paid license providing access to extra tools, support,
Qt applications adapt to the native style of the host operating system. allowing you to "Write Once