BlackScreens

BlackScreens is a small but powerful tool that allows you to darken any screen on your computer using a keyboard shortcut. It's the perfect way to give your eyes a break when you're working long hours at the computer, or when you need to focus on a certain part of the screen.

BlackScreens is very easy to use. Just download and install it, then press Alt+1, Alt+2, etc. to darken a specific screen, or press Alt+0 to darken all screens at once. You can also adjust the transparency of the screen darkening from 1% to 100%.