Lumen is a menu bar application for macOS that magically sets the screen brightness based on your screen contents.

Calise (acronym for “camera light sensor”) is a Free/Open Source python 2.x program that calculates ambient brightness and sets screen’s correct backlight using a camera.

Philips Hue Automation for the Mac Desktop. Brilliance brings the outside world into your home through Philips Hue lights. Set your location, choose what kind of lighting you want: sunlight, weather-based, urban lighting, northern lights, and more, set a schedule to turn the lights on and off, then sit back and enjoy your lights without having to fiddle with an app or dimmers.