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.

Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

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

Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.

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

OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.