Insomniate - Insomniate is a highly lightweight application that keeps your PC from going into Sleep/Standby mode.
Caffeinated - Caffeinated is a clone of a comparative Mac OSX apparatus called Caffeine and stops your PC going into standby.
Theine - Prevent your Mac from falling asleep, dimming your screen or starting the screensaver.
Caffeine for Windows - Prevent your computer from going to sleep
Caffeine - Caffeine is a social broadcasting platform for gaming, entertainment, and the creative arts.
Caffe1ne - Caffe1ne is a utility to keep your PC from locking, resting, or actuating screensaver after sit out of gear time dictated by different framework settings.