Qt is a comprehensive application and UI framework for developing Mac applications that can also be deployed across many other desktop and embedded operating systems without rewriting the source code.Qt sets the standard for high-performance, cross-platform application development. It includes a C++ class library and tools for cross-platform development and internationalization. Qt also provides unique solutions to inter-object communication, goes beyond C++ to add flexibility for advanced GUI development and provides a special edition for back-end server applications.Qt is a comprehensive development framework that includes an extensive array of capabilities, features, and tools that enable development of cross-platform, high-performance rich-client and server-side applications.Qt is the leading framework for native cross-platform application development. The Qt API and tools are consistent across all supported platforms, enabling developers to learn one API and perform truly platform-independent application development and deployment.Qt developers only have to learn one API to write applications that run almost anywhere. We have put considerable effort into making Qt as easy to use and intuitive as possible. Customers tell us that we succeeded: they find Qt programming simple and enjoyable. For the business this translates into more functionality and less maintenance without having to sacrifice quality. The uniform cross-platform API lets programmers concentrate on value-adding innovation, instead of worrying about maintaining and administering infrastructure and interfaces for multiple versions of existing applications.NOTE: Qt is offered to the Open Source community under Trolltech's Dual Licensing Model. Therefore it is freely available for the development of Open Source software governed by the GNU General Public License (GPL version 2). For proprietary, commercial development conditions and for further licensing details please visit http://trolltech.com/products/qt/licenses/licensing/opensource.Here are some key features of "Qt":

Ссылка: ftp://ftp.troll..rce/qt-mac-opensource-4.5.2.dmg