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.
YoruFukurou - YoruFukurou (NightOwl) is a Twitter client for Mac OS X, designed for Twitter addicts.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Echofon for Twitter - Download Echofon apk 3.1.3.3 for Android. Echofon for Android - A super clean Twitter app
Better Uptime - We call you when your website goes down
Talon for Twitter - Elegantly designed, ad-free Twitter experience for Android