Pingdom offers cost-effective and reliable server, network and website monitoring. We use a global network of servers to monitor our customers' sites 24/7, all year long. The service includes statistics for uptime and response time, and can send out alerts via SMS and email.
If you like Pingdom Tools you can include a banner on your website that lets all your visitors use it. You add it with just a few lines of HTML code. The Pingdom Tools banner is available on our "Link to us" page.