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JuiceDefender - Über 5.
Save contacts - Save contacts app provides features through which users can select the desired data to create the backup in a variety of different formats.
Easy Battery Saver - Easy Battery Saver, your super battery savior
My Contacts by Captain Tushar - My Contacts is an app by Captain Tushar that comes up with features to help you in managing your contacts list so you can effortlessly delete or edit existing contacts.
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.
SMS Backup+ - Backup Android SMS, MMS and call log to Gmail / Gcal / IMAP - jberkel/sms-backup-plus