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Candidates for inclusion:

• https://projects.kde.org/libqinfinity
• http://sourceforge.net/p/blackchocobo/code/HEAD/tree/FF7tk/, http://forums.qhimm.com/index.php?topic=12938.msg184462
• http://quazip.sourceforge.net/
• http://code.google.com/p/google-diff-match-patch, http://code.google.com/p/google-diff-match-patch/source/browse/trunk/cpp/diff_match_patch.cpp)
• QtModeling -> http://qt.gitorious.org/qt/qtmodeling / http://qt-project.org/wiki/QtModeling
• QtOptimization ->http://gitorious.org/qtoptimization/qtoptimization
• qtffmpegwrapper : https://code.google.com/p/qtffmpegwrapper/
• kdab products: kdtools, kdcharts etc... http://www.kdab.com/kdab-products/
• qslog https://bitbucket.org/razvanpetru/qt-components/wiki/QsLog
• https://qt.gitorious.org/qtplayground/qlogger/, https://qt.gitorious.org/qtplayground/qlogger/commits/f4ee68c887f02e42330d78c4e293fc4298e51e5a
• http://pythonqt.sourceforge.net/
• QDbf: https://code.google.com/p/qdbf/
• QSerialPort: http://sourceforge.net/projects/qserialport/ (NOT the official Qt 5 module)
• QextSerialPort: http://sourceforge.net/projects/qextserialport/
• QWebSocket: https://github.com/KurtPattyn/QWebSockets
• QJsonRpc: https://bitbucket.org/devonit/qjsonrpc
• QtKOAuth (a.k.a. kQOAuth): http://www.johanpaul.com/blog/kqoauth/
• QtGamepad: https://github.com/nezticle/qtgamepad
• QtSpeech: http://lynxline.com/projects/qtspeech/
• QtGoogleSpeech: https://github.com/niqt/QtGoogleSpeech
• QtGStreamer: http://gstreamer.freedesktop.org/modules/qt-gstreamer.html
• QCustomPlot: http://www.qcustomplot.com/
• QtLua: http://www.nongnu.org/libqtlua/
• QScintilla: http://www.riverbankcomputing.com/software/qscintilla/intro
• https://github.com/dancasimiro/qtuiotouch
• http://qtuio.sirbabyface.net/

Reports

NCReport

Report engine & designer module commercial http://www.nocisoft.com/ncreport.html

Other options

• http://www.kdab.com/kdab-products/kd-reports//[kdab.com]/
• http://qt-apps.org/content/show.php/eXaro?content=78870/[qt-apps.org]/
• http://qt-apps.org/content/show.php/TableView+Printer?content=76616/[qt-apps.org]/
• http://qt-apps.org/content/show.php/TextPrinter?content=62383/[qt-apps.org]/

Charting

QTitanChart

commercial http://www.devmachines.com/qtitanchart-overview.html http://qt-project.org/forums/viewthread/18685/

KD Chart

GPL + commercial http://www.kdab.com/kdab-products/kd-chart/

Unknown licence (unreleased as of yet) http://qt-project.org/forums/viewthread/4209/ http://gallery.theharmers.co.uk/index.php?/category/5 Animated charts By Sean Harmer (now @KDAB)

Ribbon

QtitanRibbon

commercial licence http://www.devmachines.com/qtitanribbon-overview.html Office 2007/2012 ribbon component

General

• http://qt-project.org/wiki/Category:Add-ons
• http://log4qt.sourceforge.net/html/index.html (logging, Apache, looks a bit dead)
• http://gitorious.org/ofi-labs (various stuff. Some experimental, some very nice)
• http://jpnaude.github.io/Qtilities/
• http://dev.libqxt.org/libqxt/wiki/Home (LGPL, assortment of very useful stuff)

Medical

• http://www.commontk.org http://www.commontk.org/ (Component framework, DICOM, etc. Apache license)