WebGazer is an uptime monitoring platform that checks if your website is up as it should be and notifies you if anything goes wrong
UptimeRobot - Free Website Uptime Monitoring
Reddit List - Tracking the top 5000 subreddits
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.
Upvoted - A news publication by reddit
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Mailbrew - Automated email digests from Twitter, Reddit, YouTube & more