I've recently started learning c++ and it's going pretty well. So far i've made a couple of console applications. I'm curious of what library/framework i'm supposed to use if I want to make a GUI application in c++? I am aware of SDL and SFML to make games but I don't know what to use if I want to make a simple program with a graphic interface. I have a mac and i'm using Xcode as IDE.

Qt is great for cross-platform stuff.

I prefer gtkmm (a C++ wrapper of GTK+) over Qt, and I don't have any experience with wxWidgets. But you should probably take a quick look at all of them (so you know roughly what they are like) and then just pick one and start writing code.