Superkb is a keyboard-based application launcher based on a hotkey (usually the Super key) that allows for on-screen keyboard hints to be displayed if the hotkey is held long enough without calling any bound action.

alttab provides convenient visual interface and switching on releasing Alt, not on pressing Tab key. Being lightweight and depending only on basic X11 libs, it still features customizable look and behaviour.

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.