Caffeine for Mac
Caffeine for Windows
KeepingYouAwake
Caffeine for Linux
KeepOn
Belay by PerfectoWeb
caffeinate & disablesleep
NeverNap prevents your Mac from sleeping or activating the screensaver. For 5 minutes or indefinitely. Perfect for presentations or long processes.

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When comparing NeverNap and Diffee, you can also consider the following products.

Caffeine is a tiny program that puts an icon in the right side of your menu bar.
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Prevent your computer from going to sleep
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A Caffeine clone for macOS Yosemite, El Capitan and Sierra (including Dark Mode).
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Inspired by the Mac OS X version, Caffeine for Linux is a status bar application able to...
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Keep your screen on smartly and easily with Quick Settings.
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A free menu bar app that keeps your Mac awake while Claude Code, Codex, Cline and Copilot work – not caffeinate, but a power layer for local AI agents on macOS.
Compare Belay by PerfectoWeb to NeverNap or Diffee: