Qt 5.15
Qt is a full development framework with tools designed to streamline the creation of applications and user interfaces for desktop, embedded, and mobile platforms.
Qt Framework
Intuitive APIs for C++ and JavaScript-like programming with Qt Quick for rapid UI creation.
Qt Creator IDE
A powerful cross-platform integrated development environment, including UI designer tools and on-device debugging.
Licenses Used in Qt
Qt Framework and tools are available under both open-source and commercial licenses.
The commercially licensed Qt contains additional functionality and productivity tools. For details, see http://www.qt.io/download/.