Free, open-source alternatives to Amphetamine

Amphetamine keeps a Mac awake from a menu bar switch, either indefinitely, for a set time or until a download or app finishes. Triggers can start a session automatically, for example while a display is connected or the Mac is charging, and it can keep a MacBook running with the lid closed.

The open-source apps below share the core job of preventing sleep from the menu bar for a chosen period. KeepingYouAwake is a simple timer switch built on macOS sleep prevention and does not cover closed-lid use. Americano adds custom durations and stops itself on battery or power changes, while Sleepless focuses on keeping a closed MacBook awake with a timer and a battery floor.