Trustroots - Travellers community for sharing, hosting and getting people together.
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.
BeWelcome - Open your door to the world!
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Hospitality Club - Free network of people around the world who offer free accommodation, advice and help when they are traveling - hospitality exchange. Free membership.
Better Uptime - We call you when your website goes down