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Website Monitoring, Website Monitoring Service, Server Monitoring: Site24x7
site24x7.comSite24x7 offers both free & paid website monitoring services. Monitor websites remotely and receive instant email/sms alerts if your website becomes unavailable. View uptime & performance graphs of your website monitors.
updown.io – Website monitoring, simple and inexpensive
updown.ioupdown is an online service that checks your website's status by periodically sending an HTTP request to the URL of your choice. It then notifies you by email or sms when your website is not responding correctly.
Monitor your entire website, not just the homepage. - Oh Dear!
ohdear.appComplete website monitoring: from multiple locations, broken links & mixed content detection & advanced ssl certificate reporting.