Accubattery - Monitor's battery capacity through the use of science
BatteryCare - BatteryCare - Application and good practice guide for maintaining and optimizing the battery of the modern laptop
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)
BatteryMon - BatteryMon is a battery monitoring software solution.
GSam Battery Monitor - Monitor your android devices battery usage.
DU Battery Saver - DU Battery Saver, get up to 50% more battery life for your Android phone. Battery Saver learns how you use your phone, then creates smart profiles that match your settings to your needs while getting more life from your battery.