12.4. QtRuby
Qt is a GUI toolkit created and distributed by Trolltech. The main focus of Qt is to be a multiplatform toolkit that provides the same programmatic interface for Windows, Mac, and UNIX operating systems. Developers need only write the code once; it compiles on each of the three platforms without modification.
Qt is distributed via dual license—either the GPL or a purchased commercial license for proprietary work. This dual license scenario is also used by other companies such as MySQL. It allows the toolkit to be used by open-source projects that may benefit from many of the offered features. It also allows Trolltech a revenue stream from the sale of commercial licenses for customers who may want to use a less restrictive license ...
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