Caffeine for Mac - Caffeine is a tiny program that puts an icon in the right side of your menu bar.
Caffeine for Linux - Inspired by the Mac OS X version, Caffeine for Linux is a status bar application able to...
KeepingYouAwake - A Caffeine clone for macOS Yosemite, El Capitan and Sierra (including Dark Mode).
Caffeine for Windows - Prevent your computer from going to sleep
AntiSleep - AntiSleep is a powerful software that prevents the system from going into hibernate mode.
Econap - Put your PC to sleep when it's really idle