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.

WakesApp - The simplest way ever to send reminders to friends

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

Grailed - Buy and sell used menswear

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

Badger - A fast key-value store written natively in Go