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.
Logwatch - Logwatch is a customizable log analysis system.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
BareTail - BareTail is a real-time log file monitoring tool. Features Real-time file viewing
Better Uptime - We call you when your website goes down
TAI .NET - .NET Framework 4.5 is a highly compatible, in-place update to .NET Framework 4.