Greenify - Greenify is a mobile app that gives you greater control over your Android device's power usage, allowing you to get a lot more mileage out of your battery life without having to constantly plug it back into a charger.

BatteryCare - BatteryCare - Application and good practice guide for maintaining and optimizing the battery of the modern laptop

Accubattery - Monitor's battery capacity through the use of science

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)

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.

GSam Battery Monitor - Monitor your android devices battery usage.