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# About Qt

Qt by Trolltech is a C++ toolkit for cross-platform GUI application development. Qt provides single-source portability across Microsoft Windows, Mac OS X, Linux, and all major commercial Unix variants. (A version of Qt 4 for embedded Linux will be available in August/September 2005.)

Qt provides application developers with all the functionality needed to build applications with state-of-the-art graphical user interfaces. Qt is fully object-oriented, easily extensible, and allows true component programming. Read the Whitepaper for a comprehensive technical overview.

Since its commercial introduction in early 1996, Qt has formed the basis of many thousands of successful applications worldwide. Qt is also the basis of the popular KDE Linux desktop environment, a standard component of all major Linux distributions. See our Customer Success Stories for some examples of commercial Qt development.

Qt is supported on the following platforms:

- Microsoft Windows -- 95, 98, NT 4.0, ME, 2000, and XP
- Unix/X11 -- Linux, Sun Solaris, HP-UX, HP Tru64 UNIX, IBM AIX, SGI IRIX and many others
- Mac OS X -- Mac OS X 10.2+

Qt is released in different editions:

- The Qt Commercial Editions provide for commercial software development. It permits traditional commercial software distribution and includefree upgrades and Technical Support. For the latest prices, see the Trolltech web site's Pricing and Availability page or contact sales@trolltech.com.

- The Qt Open Source Edition is available for Unix/X11, Mac OS X and Embedded Linux. The Open Source Edition is for the development of Free and Open Source software only. It is provided free of charge under the terms of both the Q Public License and the GNU General Public License.

Trolltech also provides Qt Solutions, a growing range of industry and platform specific components that complement Qt. Some of these are only available to commercial customers, others are available to all Qt users.