1. Mac
2. Utilities & Operating Systems
3. System Utilities
4. Caffeine Download

Put a menu bar item to temporarily disable sleep and screen savers.

Caffeine Editor's review

Caffeine for Mac is a great utility for preventing the computer from starting its screensaver, going to sleep, or automatically dimming its screen after a period of inactivity. It's like serving your computer a cup of coffee, so that it remains awake, just like the user does while watching a movie or reading a document. Caffeine is very simple to activate: just click on the coffee icon on the Menu bar to enable it and then click again to disable it.
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