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)
GSam Battery Monitor - Monitor your android devices battery usage.
Accubattery - Monitor's battery capacity through the use of science
BatteryBar Pro - BatteryBar Pro is software for windows that enables users to check their Battery performance and stats.
BatteryInfoView - small utility for laptops and netbook computers that displays the current status and information about your battery
BatteryBar - Track battery life with BatteryBar and BatteryBar Pro for Windows. Statistical calculations on past usage give BatteryBar increased accuracy.