reWASD
One of my favourite applications available on Windows, and a major reason I do not use Linux.
Maps keyboard, gamepad, and mouse inputs to almost anything else. Works so well that I no longer use QMK.
I used it to play Cyberpunk 2077 with Joy-Cons, using flick stick and gyro aiming.
Developed by Ukrainians, who donate proceeds to defend against the Russian invasion of Ukraine. Thus, this software disables itself if used from Russian or Belarus IP address ranges.