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.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Accubattery - Monitor's battery capacity through the use of science
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Power Battery - Power Battery, as the most professional battery saver app, could get up about 60% more battery life for Android phones or tablets.
LightShot - The fastest way to take a customizable screenshot.