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{{Use dmy dates|date=October 2015}}
{{Infobox organization
| name = Qt Project
| logo = Qt logo 2015neon 2022.svg
| logo_size = 64px
| founder = [[Nokia]]
| founded_date = {{Start date and age|df=yes|2011|10|21|formatdf=dmyyes}}
| type = Community
| key_people = =
| focus = [[Free software]]
| products = [[Qt (framework)|Qt]], [[Qt Creator]]
| method = Development and documentation
| homepage = [http://qt.io/ The Qt Company]
}}
 
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With the release of Qt 2.0, the license was changed to the [[Q Public License]] (QPL), a [[free software]] license but one regarded by the [[Free Software Foundation]] as incompatible with the GPL. A compromise was found 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. This led to the creation of the KDE Free Qt Foundation which guarantees that Qt would fall under a [[BSD-style license]] should no free/open source version of Qt be released during a period of 12 months.<ref name="foundation">{{cite web|url=http://www.kde.org/community/whatiskde/kdefreeqtfoundation.php |title=Free Qt Foundation |publisher=KDE |access-date=2013-05-08}}</ref>
 
In 2000, Qt 2.2 was released under the GPL v2, ending all controversy regarding GPL compatibility.<ref name="Qt2.2-GPL">{{cite web |url=http://www.linuxplanet.com/linuxplanet/reports/2269/1/ |title=Trolltech to Release Qt Under GPL - Decision Alters Linux GUI Landscape - Reports |publisher=LinuxPlanet |date=2000-09-04 |access-date=2013-05-08 |archive-date=24 March 2018 |archive-url=https://web.archive.org/web/20180324223759/http://www.linuxplanet.com/linuxplanet/reports/2269/1/ |url-status=dead }}</ref>
 
On 28 January 2008 Nokia announced tothat it would acquire Trolltech.<ref>{{cite web|url=http://www.nokia.com/A4136001?newsid=1185531|title=Nokia to acquire Trolltech to accelerate software strategy |date=28 January 2008|access-date=28 January 2008}}</ref><ref>{{cite web|last=Paul |first=Ryan |url=https://arstechnica.com/information-technology/2008/01/nokia-buys-trolltech-will-become-a-patron-of-kde/ |title=Nokia to buy Trolltech, will become a patron of KDE |publisher=Ars Technica |date=2008-01-28 |access-date=2013-05-08}}</ref>
 
On 14 January 2009 Qt version 4.5 was [[Software relicensing|relicensed]], adding [[LGPL]] as licensing option.<ref>{{cite web|url=http://dot.kde.org/2009/01/14/qt-everywhere-45-be-relicensed-lgpl |title=Qt Everywhere: 4.5 To Be Relicensed As LGPL |date=14 January 2009 |access-date=2013-05-08}}</ref>
 
The Qt Project was founded on 21 October 2011.<ref name="open governance" /><ref>{{cite web|last=Meyer |first=David |url=httphttps://www.zdnet.com/article/nokia-gives-qt-open-source-governance-3040094261/ |title=Nokia gives Qt open-source governance |publisher=ZDNet |date=2011-10-24 |access-date=2013-05-08}}</ref> In August 2012 Digia announced tothat it would acquire all rights to Qt and take Nokia's role within the Qt Project.<ref name="DigiaQt" />
 
== Governance ==
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Qt's Open Governance is modelled after [[WebKit|WebKit's]].<ref>{{cite web|url=http://www.golem.de/1106/84244.html |title=Nokia: Qt 5 soll im April 2012 erscheinen |publisher=Golem.de |language=de |date=2011-06-16 |access-date=2013-05-08}}</ref><ref>{{cite web|author=Anita Klingler |language=de |url=http://www.zdnet.de/41557441/nokia-startet-qt-projekt-mit-unabhaengiger-infrastruktur/ |title=Nokia startet Qt-Projekt mit unabhängiger Infrastruktur |publisher=Zdnet.de |date=2011-10-24 |access-date=2013-05-08}}</ref>
 
Decision-making takes place in a process the project describes as "lazy consensus".<ref>{{citeCite web|url=http://qt-project.org/wiki/The_Qt_Governance_Model |title=The_Qt_Governance_Model &#124;The Qt WikiGovernance Model - |publisher=Qt ProjectWiki |dateurl=2012-09-25https://wiki.qt.io/The_Qt_Governance_Model |access-date=20132022-0507-0820 |website=wiki.qt.io}}</ref>
 
The project facilitates online communication among its developers and community members through public forums,<ref>{{cite web|url=https://qt-project.org/forums |title=forums |publisher=Qt Project |access-date=2013-05-08}}</ref> mailing lists,<ref>{{cite web |url=http://lists.qt-project.org/mailman/listinfo |title=Mailing Lists |publisher=Lists.qt-project.org |access-date=2013-05-08 |archive-date=29 March 2013 |archive-url=https://web.archive.org/web/20130329074529/http://lists.qt-project.org/mailman/listinfo/ |url-status=dead }}</ref> and wiki pages.<ref>{{cite web|url=http://qt-project.org/wiki/ |title=index &#124; Qt Wiki |publisher=Qt Project |date=2013-03-29 |access-date=2013-05-08}}</ref>
 
== Participating organizations ==
[[File:Qt contributors 2013W18 without Digia.png|thumb|300px|Distribution of non-Digia Qt contributors (2013, Week 18)]]
Aside from the project leader Digia and various individuals, a number of other organizations participate in the Qt Project.<ref name="Stats2012">{{cite web|last=Macieira |first=Thiago |url=http://www.macieira.org/blog/2012/04/qt-project-statistics/ |title=Qt Project Statistics | work = Thiago Macieira's blog |publisher=Macieira.org |access-date=2013-05-08}}</ref> Second-largest Qt contributor is [[Klarälvdalens Datakonsult AB|KDAB]], a Swedish Qt consulting company.<ref>{{cite web|url=http://www.kdab.com/kdab-contributions-to-qt-5-0-part-1/ |title=contributions to Qt 5.0 (part 1) |publisher=KDAB |date=2012-12-20 |access-date=2013-05-08}}</ref> KDAB is involved in many areas, including maintenance of several components.<ref>{{cite web|url=http://www.kdab.com/kdab-contributions-to-qt-5-0-part-2/ |title=contributions to Qt 5.0 (part 2) |publisher=KDAB |date=2012-12-21 |access-date=2013-05-08}}</ref><ref>{{cite web|url=http://www.kdab.com/maintaining-qt3d/ |title=Maintaining Qt3D |publisher=KDAB |date=2012-12-21 |access-date=2013-05-08}}</ref> KDAB together with [[BlackBerry (company)|RIM/BlackBerry]] are maintaining the [[QNX]] and [[BlackBerry 10]] ports of Qt.<ref name="Stats2012" /><ref>{{cite web |url=http://www.kdab.com/qt5-on-the-qnx-operating-system/ |title=Qt5 on the QNX operating system |publisher=KDAB |date=2012-04-19 |access-date=2013-05-08 |archive-date=19 July 2013 |archive-url=https://web.archive.org/web/20130719064617/http://www.kdab.com/qt5-on-the-qnx-operating-system/ |url-status=dead }}</ref>
 
Another big participator is [[Intel]], contributing for example [[Wayland (display server protocol)|Wayland]] support.<ref>{{cite web|url=https://www.phoronix.com/scan.php?page=news_item&px=ODYyNQ |title=[Phoronix&#93; Qt Is Now Drawing On Wayland |publisher=Phoronix.com |date=2010-09-21 |access-date=2013-05-08}}</ref> [[AudioCodes]] maintains [[IBM Rational ClearCase|IBM ClearCase]] support in [[Qt Creator]].<ref>{{cite web|url=http://wiki.qt.io/Maintainers |title=Maintainers &#124; Qt Wiki |publisher=Qt Project |date=2013-04-12 |access-date=2013-05-08}}</ref>