Controversy erupted around 1998 when it became clear that the K Desktop Environment was going to become one of the leading desktop environments for Linux.
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 12 months. In 2000, Qt/X11 2.2 was released under the GPL v2, ending all controversy regarding GPL compatibility. At the end of 2001, Trolltech released Qt 3.0, which added support for Mac OS X (now known as macOS).
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 12 months. In 2000, Qt/X11 2.2 was released under the GPL v2, ending all controversy regarding GPL compatibility. At the end of 2001, Trolltech released Qt 3.0, which added support for Mac OS X (now known as macOS).
The Mac OS X support was available only in the proprietary license until June 2003, when Trolltech released Qt 3.2 with Mac OS X support available under the GPL. In 2002, members of the KDE on Cygwin project began porting the GPL licensed Qt/X11 code base to Windows.
The Mac OS X support was available only in the proprietary license until June 2003, when Trolltech released Qt 3.2 with Mac OS X support available under the GPL. In 2002, members of the KDE on Cygwin project began porting the GPL licensed Qt/X11 code base to Windows.
The project achieved reasonable success although it never reached production quality. This was resolved when Trolltech released Qt 4.0 also for Windows under the GPL in June 2005.
The GPL exception allows the final application to be licensed under various GPL-incompatible free software/open source licenses such as the Mozilla Public License 1.1. === Acquisition by Nokia === Nokia acquired Trolltech ASA on 17 June 2008 and changed the name first to Qt Software, then to Qt Development Frameworks. Nokia focused on turning Qt into the main development platform for its devices, including a port to the Symbian S60 platform.
Version 1.0 of the Nokia Qt SDK was released on 23 June 2010.
One month later, Nokia announced the sale of Qt's commercial licensing and professional services to Digia, with the immediate goal of taking Qt support to Android, iOS and Windows 8 platforms, and to continue focusing on desktop and embedded development, although Nokia was to remain the main development force behind the framework at that time. === Merging and demerging with Digia === In March 2011, Nokia sold the commercial licensing part of Qt to Digia, creating Qt Commercial.
In August 2012, Digia announced that it would acquire Qt from Nokia.
The Qt team at Digia started their work in September 2012.
In May 2016, Digia and Qt demerged completely into two independent companies. === The Qt Project and open governance === Qt 5 was officially released on 19 December 2012.
They released Qt 5.0 within a month and newer versions every six months with new features and additional supported platforms. In September 2014, Digia transferred the Qt business and copyrights to their wholly owned subsidiary, The Qt Company, which owns 25 brands related to Qt.
In May 2016, Digia and Qt demerged completely into two independent companies. === The Qt Project and open governance === Qt 5 was officially released on 19 December 2012.
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 is Qt 6.0, which was released on 8 December 2020. The current long-term support (LTS) version is Qt 5.15 LTS.
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