APNdroid - Enable or disable your phone's internet connection
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.
JuiceDefender - Über 5.
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.
Smart Wifi Toggler - Download the latest version of Smart WiFi Toggler for Android. Manage your data and battery usage by controlling your WiFi settings
GSam Battery Monitor - Monitor your android devices battery usage.