Insomniate - Insomniate is a highly lightweight application that keeps your PC from going into Sleep/Standby mode.
Caffeine for Windows - Prevent your computer from going to sleep
Caffeinated - Caffeinated is a clone of a comparative Mac OSX apparatus called Caffeine and stops your PC going into standby.
Caffeine for Linux - Inspired by the Mac OS X version, Caffeine for Linux is a status bar application able to...
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.
KeepingYouAwake - A Caffeine clone for macOS Yosemite, El Capitan and Sierra (including Dark Mode).