polychromatic.app
Polychromatic is an RGB lighting management front-end application for GNU/Linux. It is a frontend for OpenRazer that lets Razer devices control lighting effects and more, supporting over 210 devices including keyboards, mice, mouse mats and headsets. It runs locally without clouds or login, is licensed under the GPLv3, and includes firmware configuration, custom effects and a tray applet on compatible desktop environments.