What is Qt?

Qt is a cross-platform application and UI framework. Using Qt, you can write applications once and deploy them across desktop, mobile and embedded operating systems without rewriting the source code.

Qt is a complete C++ application development framework, which includes a class library and tools for cross-platform development and internationalization.

Qt supports the development of cross platform GUI applications with its “write once, compile anywhere” approach. Using a single source tree and a simple recompilation, applications can be written for Windows 98 to XP and Vista, Mac OS X,S60,Linux, Solaris, HP-UX, and many other versions of Unix with X11. Qt applications can also be compiled to run on embedded Linux and Windows CE platforms.

Qt is available under various licenses.If you want to build commercial applications,you must buy a commercial Qt license; if you want to build open source programs, you can use the open source (GPL) edition.