Stacer - Ubuntu system optimizer
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.
Ultimate Windows Tweaker - Ultimate Windows Tweaker is a freeware Tweak UI Utility for tweaking and optimizing Windows.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Ubuntu After Install - Automated installation a lot of useful extra software on Ubuntu after the initial desktop install.
Better Uptime - We call you when your website goes down