Qt (pronounced "cute") is cross-platform software for creating graphical user interfaces as well as cross-platform applications that run on various software and hardware platforms such as Linux, Windows, macOS, Android or embedded systems with little or no change in the underlying codebase while still being a native application with native capabilities and speed. Qt is currently being developed by The Qt Company, a publicly listed company, and the Qt Project under open-source governance, involving individual developers and organizations working to advance Qt. Qt is available under both commercial licenses and open-source GPL 2.0, GPL 3.0, and LGPL 3.0 licenses. Purposes and abilities Qt is used for developing graphical user interfaces (GUIs) and multi-platform applications that run on all major desktop platforms and most mobile or embedded platforms. Most GUI programs created with Qt have a native-looking interface, in which case Qt is classified as a widget toolkit. Non-GUI programs can also be developed, such as command-line tools and consoles for servers. An example of such a non-GUI program using Qt is the Cutelyst web framework. Qt supports various compilers, including the GCC C++ compiler, the Visual Studio suite, PHP via an extension for PHP5, and has extensive internationalization support. Qt also provides Qt Quick, that includes a declarative scripting language called QML that allows using JavaScript to provide the logic. With Qt Quick, rapid application development for mobile devices became possible, while logic can still be written with native code as well to achieve the best possible performance. Other features include SQL database access, XML parsing, JSON parsing, thread management and network support. Qt releases The latest version of Qt is 6.4. Also still supported, for commercial users, are 5.15 LTS, released on 26 May 2020, and 6.2 LTS, released on 30 September 2021 – long-term support (LTS) versions are generally supported for three years, with a commercial license, while 5.15 support was extended to five years, so it is supported for longer or until 26 May 2025. In addition the KDE project provides unofficial support for, at least, Qt 5.15, i.e. not just for commercial users. Qt in use In 2017, the Qt Company estimated a community of about 1 million developers worldwide in over 70 industries. Desktop UIs Graphical user-interfaces and desktop environments that utilize Qt/QML as widget toolkit: KDE Plasma, a libre desktop environment for various computing devices DDE (Deepin Desktop Environment) of Linux Deepin UKUI (Ubuntu