Qt is a comprehensive, object-oriented development framework that enables development of high-performance, cross-platform rich-client and server-side applications. When you implement a program with Qt, you can run it on the X Window System (Unix/X11), Apple Mac OS X, and Microsoft Windows NT/9x/2000/XP by simply compiling the source code for the platform you want. Qt is the basis for the KDE desktop environment, and is also used in numerous commercial applications such as Google Earth, Skype for Linux, and Adobe Photoshop Elements.

Operating Systems

Last announcement

Qt Project Announcement 05 Nov 2011 14:45

At the end of October the Qt Project went live. This means that development of Qt will be governed as a true open source project. We now have qt-project.org – a website where all development of Qt will be centered, providing the same infrastructure and processes for everybody that wants to contribute to Qt. All development will happen in one central location, with access for everyone at the same time. No more separate code flow for “Nokians vs others”, and no more time delays! What you see is what Nokia developers see. Discussions, decisions and roadmapping will all happen in the community, by the community, for the community. Anyone can be a Contributor, and even an Approver or Maintainer if they show enough merit. For more info see: http://labs.qt.nokia.com/2011/10/21/the-qt-project-is-live/ http://blog.qt.nokia.com/2011/09/12/qt-project/

Recent releases

  •  16 Sep 2013 14:13

    Release Notes: The new Qt Quick Controls and Qt Quick Layouts modules finally offer ‘widgets’ for Qt Quick. Qt Sensors has now been added to Qt 5.1, supporting Android, Blackberry, and iOS. Qt Serial Port lets you interface with physical and virtual serial ports of your device to allow easy access to your hardware peripherals through a common cross-platform API. Qt X11 Extras provide you direct access to screen information on platforms running the X server.

    •  11 Apr 2013 11:47

      Release Notes: Qt 5.0.2 brings over 600 improvements compared to Qt 5.0.1. Qt Creator 2.7.0 is included in the release package. You can now easily skip modules in configure when building Qt yourself. Static linking now works correctly for the Qt libraries.

      •  25 Dec 2012 08:49

        Release Notes: This version represents a major overhaul of the C++ GUI programming framework. Key benefits include graphics quality improvements, higher performance on constrained hardware, cross-platform portability, support for C++11, HTML5 support with QtWebKit 2, a vastly improved QML engine with new APIs, and ease of use and compatibility with Qt 4 versions.

        •  22 May 2012 11:25

          Release Notes: This release adds over 100 functional improvements, updates WebKit to version 2.2.2 and libpng to version 1.5.10, and adds 30 improvements to documentation and tools.

          •  15 Dec 2011 12:39

            Release Notes: Qt Platform Abstraction (QPA) restructures the GUI stack to enable easier porting of Qt to different windowing systems and devices. Threaded OpenGL enables rendering OpenGL from more than one thread concurrently. HTTP requests are now handled in a separate thread by default. The filesystem stack received some heavy lifting under the hood. The result is better I/O performance.

            Recent comments

            05 May 2011 10:58 jrepin

            The best GUI toolkit ever. And so much more.

            07 Feb 2005 06:23 rwmcgwier

            Re: QT/Windows/Free
            Great News!


            07 Feb 2005 05:54 bero

            Re: QT/Windows/Free

            > When that is available, call me.

            This has been announced today:


            From: Trolltech Information

            To: qt-interest@trolltech.com

            Date: 2005-02-07 14:23:52

            Dear Qt User/Qt Customer:

            Trolltech is pleased to announce that we intend to

            make Qt 4 for Windows

            available under our successful dual licensing

            business model.  This means that

            Open Source projects under the GNU GPL license

            will be able to target all

            major operating systems using Qt 4. We plan to

            release the Windows Open Source

            version of Qt at the same time as Qt 4.


            So now everyone can finally stop using that inferior

            toolkit with 3 letters ;)

            07 Jan 2005 01:20 atomice

            Re: QT/Windows/Free

            > When that is available, call me.

            It already is: http://kde-cygwin.sourceforge.net/qt3-win32/

            01 Apr 2004 15:48 rwmcgwier

            When that is available, call me.


            Project Spotlight


            A Fluent OpenStack client API for Java.


            Project Spotlight

            TurnKey TWiki Appliance

            A TWiki appliance that is easy to use and lightweight.