Date: 2018nov23 Q. Cross platform desktop GUI framework (For Windows, Linux, Mac) A. wxWidgets https://www.wxwidgets.org/ Licence: Like LGPL https://www.wxwidgets.org/about/licence/ GTK https://www.gtk.org/ License: LGPL QT https://www.qt.io/ Licence: dual-licensed under commercial and open source licenses. https://www.qt.io/licensing/