GDLauncher stands for "Gorilla Dev Launcher", not "Geometry Dash Launcher".

It's a modded Minecraft launcher that actually kinda works with Steam Input. (Unlike my previous choices of ATLauncher and Curseforge.)

The same also applies to Quake as I use Quakespasm to play the game

Doom/Doom2 hours are inaccurate as I spend most of my time in GZDoom