Qt is a complete C++ application development framework. It includes a class library and tools for cross-platform development and internationalization. Apps like PSI and LyX 1.5.x uses this framework.
License: GNU GPL V2.
URL: http://trolltech.com/products/qt
For more information check the supporting thread within the online forum.
Current Bounty: $0
Sponsors: none
Submitter: Martin Iturbide