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.

Public - Group chats.

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

Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Power Battery - Power Battery, as the most professional battery saver app, could get up about 60% more battery life for Android phones or tablets.

Chalk - Chalk is a calculator that tries to do right what others do wrong.