FLTK - Fast Light Tool Kit - https://github.com/fltk/fltk - cross platform GUI development
Why do you think that https://github.com/antoyo/relm is a good alternative to FLTK
FLTK - Fast Light Tool Kit - https://github.com/fltk/fltk - cross platform GUI development
Why do you think that https://github.com/antoyo/relm is a good alternative to FLTK