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The KDE libraries, basis of KDE and used by many open source projects. They are based on Qt, Trolltech's cross-platform toolkit, and run on Linux, BSDs, and other Unices, as well as Microsoft Windows and Mac OS X. Licensed under GNU LGPL, they may be used by open source and proprietary applications.
Qt is a cross-platform application and UI framework. Using Qt, you can write applications once and deploy them across many desktop and embedded operating systems without rewriting the source code.