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26. Monitive
Under a free account, Monitive monitors one website, every ten minutes. You also get unlimited email and Twitter alerts.
For enhanced features you can opt for the paid plans.
25. My Hosting Uptime
MyHostingUptime is a free uptime monitoring service that provides uptime monitoring of multiple sites from multiple locations in the world. You receive alerts in the form of email and Tweets. You have to submit your website URL after registration and choose your hosting provider. If your hosting provider is not listed on their site, you can submit details about your hosting provider and it will take ten days to receive your first report.