Recommendations on gui library

I need a C gui library that I can use under linux and windows with good documentation, examples and possibly a forum. What do you suggest?

Qt
official: Qt | Cross-platform software development for embedded & desktop
wikipedia: Qt (software) - Wikipedia

GTK
official: The GTK Project - A free and open-source cross-platform widget toolkit
wikipedia: GTK - Wikipedia

Qt is not free. Does gtk have a forum for who develop gtk applications?

Qt is available under open source licenses (GPL2.0, GPL3.0, LGPL3.0).

You can google for GTK forums (I know of no secret ones).

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Originally Posted by Concorde

Qt is not free. Does gtk have a forum for who develop gtk applications?

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QT is available under both Open Source and commercial licenses.

Quote:

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Originally Posted by Concorde

Qt is not free. Does gtk have a forum for who develop gtk applications?

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For GTK take a look at :

here.