Owly

Owly screenshots

Menu bar utility that prevents your Mac from automatically sleeping.
Main Menu
Owly 1.6 : Main Menu

Alternative downloads

NoSleep
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Application that you use to prevent your computer from going to sleep and for waking it at a specified time and then keeping it awake....
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KeepingYouAwake
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Prevent your Mac from going to sleep mode for any time period you like.