Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
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.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
DU Battery Saver - DU Battery Saver, get up to 50% more battery life for your Android phone. Battery Saver learns how you use your phone, then creates smart profiles that match your settings to your needs while getting more life from your battery.
Better Uptime - We call you when your website goes down
Battery Saver - Battery Saver is a perfect tool for those smartphone users who always remain worried about the health of their phone’s battery.