Loops Feedback - Feedback on design ideas in minutes via 110m+ people
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.
Yafi - Feedback widget for your website
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Basil Chat - Design feedback via chat
Better Uptime - We call you when your website goes down