f.lux - f. lux is a piece of software for Windows, Mac, Linux, iOS, and Android that provides a blue light filter over your screen. Research suggests limiting our exposure to blue light in the hours before bedtime can help us fall asleep faster.
Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...
AutoHotkey - The ultimate automation scripting language for Windows.
Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
Batch MessageBox - Display message boxes from Windows batch files and command line programs.