Future Me - Send an email to your future self
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.
Incubate - Time-delay messaging app
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Vuash - Send secret messages safely.
Better Uptime - We call you when your website goes down