SleepWithMe automatically puts your Mac to sleep after a certain time. Comes in handy when you’re watching a show, listening to music, or an audio book just before you go to sleep.
SlimBatteryMonitor
SlimBatteryMonitor is a replacement power gauge for Apple’s Mac OS X that tracks both laptop batteries and many UPS batteries. It takes 70% less space than Mac OS X battery indicator.
Theine
Theine keeps your Mac awake just like caffeine does with you. It prevents your Mac from falling asleep, dimming your screen or starting the screensaver.
Turbo Boost Switcher
Turbo Boost Switcher allows you to enable and/or disable Turbo Boost on you MacBook Air, primarily as a way to increase battery life.
Upper Volta
A free replacement for macOS’ battery status indicator, with a lot of functionality. Runs on both macOS Catalina and Big Sur.