Seems pretty clear to me: https://www.qt.io/download https://www.qt.io/download Most of it is licensed under LGPLv3, some under GPLv3, and there are commercial

Seems pretty clear to me: https://www.qt.io/download https://www.qt.io/download Most of it is licensed under LGPLv3, some under GPLv3, and there are commercial licenses available for almost all of it.