NoSleep is described as 'Makes closing of your MacBook lid possible without going to a sleep mode. Now you shouldn't have to plug your mouse and monitor to stay computer awake - just activate it by clicking a menu bar icon or check a tick in the System Preferences and continue downloading' and is an app in the sport & health category. There are more than 25 alternatives to NoSleep for a variety of platforms, including Mac, Windows, Linux, Flathub and Homebrew apps. The best NoSleep alternative is goguma app, which is both free and Open Source. Other great apps like NoSleep are Amphetamine, Stimulator, Caffeine for Mac and caffeinate & disablesleep.