Qt is a cross-platform C++ application and UI framework providing widgets, a declarative QML language, signals-and-slots event handling, and abstractions for graphics, networking, and threading. It enables a single codebase to target desktop, mobile, and embedded platforms with native look and feel. It is widely used to build performant desktop clients and 3D-capable interfaces.
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- Qt’s signals-and-slots model decouples event producers from consumers, while QML enables declarative, GPU-accelerated UIs. It spans desktop, embedded, and mobile targets, with licensing available under commercial and open-source (LGPL/GPL) terms, an important consideration for distribution.