Qt is Digia's full framework that enables the development of powerful, interactive and platform-independent applications. Qt applications run native on desktop, embedded and mobile host systems, enabling them to deliver performance that is far superior to other cross-platform application development frameworks.
Qt’s support for multiple platforms and operating systems allows developers to save significant time related to porting to other devices.
Qt is platform 'agnostic' and ensures developers are able to target multiple platforms with one framework by simply reusing code.
Digia is responsible for all Qt activities including product development and commercial and open source licensing.
For more informatuon, visit http://qt.digia.com