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.
Plume - App for writing documents, scripts, books and more.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Flamingo for Twitter - Flamingo for Twitter is a bright and colorful Twitter client that comes with a simple interface.
Better Uptime - We call you when your website goes down
Twicca - Twicca is a Twitter client for Android that is simply awesome. Features: * Notification