Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...
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.
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...