iBetterCharge tracks the power of your iOS devices. When they hit a specific battery capacity (or are fully charged up when plugged in), the app will let you know.
When you have some lengthy task for your computer to do, it’s annoying to have to turn off your screensaver and turn off the sleep timer, only to have to turn it all back on again when you’re done. Jiggler is a freeware menu bar app that keeps your Mac awake. It’s a little helper that bumps your mouse every once in a while to keep your machine alert.
The menu bar app Juice! keeps an eye on your MacBook’s battery charge level and can play a sound when it’s time to plug in or when it’s OK to disconnect from the mains.
This free menu bar app prevents your Mac from sleeping, dimming the screen or activating the screen saver.