The latest version is Qt 5. The current LTS version is Qt 5. It was released on 6 December and will be supported for 3 years. In , the Qt Company estimated a community of about 1 million developers worldwide  in over 70 industries. Many notable open-source or proprietary cross-platform software are using Qt or QML :. There are cases where applications have ported their user interface code from another cross-platform toolkit to Qt to solve the problems they had with them:.
Starting with Qt 4. Enterprise Controls  are commercially sold by The Qt Company. After Nokia opened the Qt source code to the community on Gitorious various ports appeared. There are also some ports of Qt that may be available, but are not supported anymore. These platforms are listed in List of platforms supported by Qt. See also there for current community support for other lesser known platforms, such as SailfishOS.
Qt is available under the following free software licenses:  GPL 2. In addition, Qt has always been available under a commercial license, like the Qt Commercial License ,  that allows developing proprietary applications with no restrictions on licensing. Qt comes with its own set of tools to ease cross-platform development, which can otherwise be cumbersome due to different set of development tools.
In addition to Qt Creator, Qt provides qmake , a cross-platform build script generation tool that automates the generation of Makefiles for development projects across different platforms. There are other tools available in Qt, including the Qt Designer interface builder and the Qt Assistant help browser which are both embedded in Qt Creator , the Qt Linguist translation tool, uic user interface compiler , and moc Meta-Object Compiler.
The toolkit was called Qt because the letter Q looked appealing in Haavard's Emacs typeface, and "t" was inspired by Xt , the X toolkit.
On 20 May Troll Tech publicly released Qt 0. Trolltech used this license until version 1. Controversy erupted around when it became clear that the K Desktop Environment was going to become one of the leading desktop environments for Linux. As it was based on Qt, many people in the free software movement worried that an essential piece of one of their major operating systems would be proprietary.
With the release of version 2. Compromises were sought between KDE and Trolltech whereby Qt would not be able to fall under a more restrictive license than the QPL, even if Trolltech was bought out or went bankrupt. At the end of , Trolltech released Qt 3. This was resolved when Trolltech released Qt 4. The GPL v3 with special exception  was later added as an added licensing option.
Nokia focused on turning Qt into the main development platform for its devices, including a port to the Symbian S60 platform. Version 1. On 14 January , Qt version 4.
In February , Nokia announced its decision to drop Symbian technologies and base their future smartphones on the Windows Phone platform instead and since then support for that platform has also been dropped. In September , Digia transferred the Qt business and copyrights to their wholly owned subsidiary, The Qt Company, which owns 25 brands  related to Qt.
Another participator is Intel , contributing for example Wayland support.
Qt Wiki provides a comprehensive list of English books about Qt. From Wikipedia, the free encyclopedia. Object-oriented framework for GUI creation. See also: Qt version history. See also: Category:Software that uses Qt. See also: Category:Proprietary software that uses Qt.
See also: Category:Software that was ported from wxWidgets to Qt.
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Main article: List of language bindings for Qt 5. See also: List of language bindings for Qt 4. Main article: List of platforms supported by Qt. See also: Qt Creator. Main article: Qt Project. Blanchette, Jasmin; Summerfield, Mark 14 February Prentice Hall. Summerfield, Mark 23 August Fitzek, Frank H. Archived from the original on 19 December Summerfield, Mark 28 October Molkentin, Daniel 19 July No Starch Press.
Thelin, Johan 3 August Dalheimer, Matthias January O'Reilly Media. Ezust, Alan; Ezust, Paul 10 September Retrieved 5 August Qt Blog. The Qt Company. Retrieved 8 September Archived from the original on 22 February Ashlee Vance. Retrieved 19 February Retrieved 7 September Retrieved 8 May Retrieved 25 April Qt Wiki.
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Retrieved 14 October Qt Project. Retrieved 8 June Retrieved 15 June Retrieved 7 January Manjaro Linux Forum. Retrieved 25 April — via GitHub.
Archived from the original on 23 July Retrieved 14 June Retrieved 8 April Retrieved 5 September Archived from the original on 29 May Retrieved 1 March Retrieved 19 October Retrieved 28 April Retrieved 15 June — via GitHub. Retrieved 30 June January Archived from the original on 14 July Retrieved 20 May Archived from the original on 30 July Archived from the original on 6 May Michael Burton.
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