Accubattery - Monitor's battery capacity through the use of science
Fliqlo Screensaver - A screensaver that displays the time using a flip clock.
BatteryCare - BatteryCare - Application and good practice guide for maintaining and optimizing the battery of the modern laptop
Clock.saver - A simple clock screensaver based on Braun watches ⌚
coconutBattery - With coconutBattery you are always aware of your current battery health. It shows you live information about the battery in your Mac and iOS devices (iPhone, iPad)
Aerial - A beautiful aerial screensaver for your Mac