Display Power Off Utility - Display power off utility.
NirCmd - NirCmd is a small utility that allows you to do many useful tasks from command-line, without displaying any user interface: change your display settings, turn off your monitor, open the door of your CD-ROM drive, and more...
Turn Off Monitor - This utility is used to turn off monitor for PC, notebook, or netbook which is have monitor.
Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...
ScreenOff - Turn off Windows screen with a click
Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.