Several online services can report your uptime and let you know when your website is down. Most use something called “pinging” the website. When you ping a website, it gives a response and lets you know the server or website is working properly. We recommend using Pingdom to test your site.
Pingdom will send a ping to your website at different intervals automatically, and if the website does not respond, it will send you an email. When the website is back up, it will send you another email. Pingdom will also keep track and give you a report of how much your site is up (uptime). A basic account with Pingdom is entirely free.
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I think that Pingdom is good, but it is expensive for small business for example. I ams ure that you are able to find some cheaper variants or even some free tools, but they don't give any guarantee in the quality of the service.
We are always open to new free tools to help our clients. We wish there was more desktop tools of this nature that were reasonably priced.