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.
Tech Tool Store - Tech tool store is an IT professional application which contains more than 600 free technician tools packed in a simple, fully featured interface.
Power Battery - Power Battery, as the most professional battery saver app, could get up about 60% more battery life for Android phones or tablets.
Tron Script - Tron is a glorified collection of batch files that automate the process of cleaning up Windows systems.
Accubattery - Monitor's battery capacity through the use of science
Autoruns - See what programs are configured to startup automatically when your system boots and you login.