If you are constantly changing the brightness of your desktop, Twinkle Tray is a great utility for Windows. It pops up an overlay and manages the brightness of your monitor. This program supports the DDC/CI standard, although manufacturers don't always implement it. It also has extra features, such as a color temperature indicator, a clock, and sound feedback. You can even set it to automatically run at startup, so you can use it even when you're away from your computer.

The Twinkle Tray is a free tool that helps you manage the brightness of multiple monitors from one location. It adds an icon to your system tray and allows you to access the brightness settings for all your compatible displays. The software works with one display at a time, so you can choose what you want to see in each screen's brightness. The program even lets you change the brightness for all your monitors at once.

The Brightness Slider is an excellent utility that manages the brightness of multiple monitors in Windows. It can be used on external monitors and is similar to a volume mixer for Windows. The application will detect the left mouse button and display an icon on the taskbar when hovered. It will allow you to manage the brightness of your external monitors from one convenient location. It uses the DDC/CI and WMI protocol to establish communication with your screens and will automatically normalize the backlight of different monitor models.