Looking for info on QDroneCtrl

I was wondering what’s happening behind the scenes in the qdronectrl app : what libs is it using to control the drone ?
If it’s not using Olympe but rather the libs Olympe itself is using for example, I would be interested in the source code of qdronectrl.
I couldn’t find much information about qdronecontrol online, and it doesn’t seem to be open to public on your github to my dismay.