Qt history:

 

    Qt was initially developed by two persons, Haavard Nord(CEO), and Eirik Chambere(President) in early 90.

    Qt4 was published in Summer 2005(major milestone)

    It was acquired by Nokia in 2008, and then was acquired by Digia. 

    3 licenses(GPL / GNU GPL / Commericial)

    It is written in C++ originally and then Qt Quick and QML were written in JavaScript.

    Qt 5.x and Qwt 6.x 

    Rich set of Widgets and Qwt classes

Tools proviced by Qt 

    Qt Creator: IDE

    Qt Designer: GUI layout and forms builder

    Qt Linguest: Internationalization toolset

    Qt Assist: Customizable doc readere

    Qt Qmake: cross-platform build tool

    Plugin For other IDE: 

    Configure: tool 

    Qt SDK: rich C++ libraries

Qt SDK:

    Core framework, GUI framework, SQL framework, XML framework, Netwroking framework, OpenGL framework, Multimedia framework, WebKit framework, Phonon framework, 2D with Painter framework, Scene Graph framework, SVG framework

Qt Class Library:

    QtCorer: File I/O, event and object handling, multi-threading, concurrency, plugins, setting management signals, slots interobject communications mechanism.

    QtGui: