Corsair (keyboards and mouse) RGB Driver for Linux. I think this would be quite essential for gamers as a snap package.
ckb-next is an open-source driver for Corsair keyboards and mice. It aims to bring the features of Corsair’s proprietary CUE software to the Linux and Mac operating systems. This project is currently a work in progress, but it already supports much of the same functionality, including full RGB animations.
It does not have a flatpak package yet either.
Also related and helpful? (Updating Corsair firmware on Linux) https://www.addictivetips.com/ubuntu-linux-tips/update-corsair-keyboard-firmware-on-linux/