Pre-releases and Qt 1
Qt 2
Qt 3
Qt 4
Qt 4 was first released in 2005 and has been unsupported since 2015.Qt 5
Qt 5 was officially released on 19 December 2012. This new version marked a major change in the platform, with hardware-accelerated graphics, QML and JavaScript playing a major role. The traditional C++-only QWidgets continued to be supported, but did not benefit from the performance improvements available through the new architecture. Qt 5 brings significant improvements to the speed and ease of developing user interfaces. Framework development of Qt 5 moved to open governance, taking place at qt-project.org. It is now possible for developers outside Digia to submit patches and have them reviewed. The KDE project provides unofficial support for Qt 5.15 in the form of a collection of bugfix patches, most of which are backported from Qt 6. As KDE has a policy of not assigning version numbers to their patches, Linux distributions use ad-hoc schemes when using this fork of Qt5: OpenSUSE, for example, calls its June 2021 version "5.15.2+kde200".Qt 6
Qt 6 was officially released on December 8, 2020.Notes
: On 14 October 2016, KDE's 20th anniversary, a KDE developer re-released a variant of Qt 1.45 that he made work with modern Linux systems.References
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