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Qt (pronounced "cute") is a cross-platform application development framework, widely used for the development of GUI programs (in which case it is known as a Widget toolkit), and also used for developing non-GUI programs such as console tools and servers. Qt is most notably used in KDE, the web browser Opera, Google Earth, Skype, Qtopia, Photoshop Elements and OPIE. It is produced by the Norwegian company Trolltech. Nokia made an offer to acquire Trolltech on January 28, 2008.
Qt uses C++ with several non-standard extensions implemented by an additional pre-processor that generates standard C++ code before compilation. Qt can also be used in several other programming languages; bindings exist for Ada, C#, Java, Pascal, Perl, PHP (PHP-Qt), Ruby (RubyQt), and Python (PyQt). It runs on all major platforms, and has extensive internationalization support. Non-GUI features include SQL database access, XML parsing, thread management, network support and a unified cross-platform API for file handling.
Varieties
Qt is released by Trolltech on the following platforms:
Qt/X11 — Qt for X Window System (Unix / Linux);
Qt/Mac — Qt for Apple Mac OS X;
Qt/Windows — Qt for Microsoft Windows;
Qt/Embedded — Qt for embedded platforms (PDA, Smartphone, ...);
Qt/WinCE — Qt for Windows CE;
Qt Jambi — Qt for Java;
Qt is also available for embedded devices as Qtopia.
There are four editions of Qt available on each of these platforms, namely:
Qt Console — edition for non-GUI development.;
Qt Desktop Light — entry level GUI edition, stripped of network and database support.;
Qt Desktop — complete edition.;
Qt Open Source Edition — "complete" edition, with some exceptions, for free software/open source developers.;
Qt is available under a dual license, the GPL v2 or v3 with special exception and a proprietary commercial license on all supported platforms. The commercial license allows the final application to be licensed under various free software/open source licenses such as the LGPL or the Artistic License, or a proprietary software license.
Proprietary commercial development requires the commercial license, and, unlike some open source software libraries, Qt is not licensed under the GNU Lesser General Public License and does not include a GPL linking exception.
Read more at Wikipedia.org
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