Browse - Programming Tips - Cross platform desktop GUI framework

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/