Native UISystem toolsby javatoai
SleepDock
A tray sleep timer: counts down, warns you for a minute, then puts Windows or macOS to sleep.

About
A sleep timer for Windows x64 and macOS on Apple Silicon or Intel, drawn with MyGo's native UI. Set a countdown of up to 24 hours or a time of day and close the window to the tray; when time is up it warns for 60 seconds, with cancel and a 15-minute snooze, then asks the system to sleep. It follows the existing power plan and does not keep the computer awake.