Zen Mode for macOS - Hide Everything. Mute Everything.
Caffeine for Windows - Prevent your computer from going to sleep
One Switch - All your mac toggles in one place
Caffeine for Linux - Inspired by the Mac OS X version, Caffeine for Linux is a status bar application able to...
Stimulator by Bedis Nbiba - Stay awake on any Linux DE with a simple, ad-free app utilizing the cross-DE Inhibit portal.
KeepingYouAwake - A Caffeine clone for macOS Yosemite, El Capitan and Sierra (including Dark Mode).