Qt can be used to develop closed source software if you obtain a commercial license.
If you want to develop Free or Open Source software for release using a recognized Open Source license, you can use the Open Source Versions of Qt.
The table below summarizes the differences between the two commercial editions:
Please see the list of supported platforms for up-to-date information about the various platforms and compilers that Qt supports.
On the Qt web site, you can find a Qt Licensing Overview and information on Qt License Pricing for commercial editions of Qt and other Qt-related products.
To purchase, please visit the online order form.
For further information and assistance, please contact Qt sales.
Web: http://qt.nokia.com/contact.
Phone, U.S. office (for North America): 1-650-813-1676.
Phone, Norway office (for the rest of the world): +47 21 60 48 00.