This tool lets you close all running applications with just a single click. It doesn’t use any system resources at all and unloads right after completing its task. CloseAll simply flashes a ‘close’ signal to all open applications on the desktop and then ceases.
CloseAll is indeed very handy if you are running many applications at the same time and want all of them to quit instantly. It works just as if you were pressing the close button of each application.
CloseAll - 64-bit software