Monitors status pages of cloud services with optional notifications and creates a unified status page of your service dependencies. I wrote a blog post recently about how profitable (barely) it is: https://blog.statusgator.com/anatomy-of-a-profitable-side-pr...
I am really interested in real-time, or timely monitoring of external services. I'll check the service out, but curious if any of it is open source, and hos you verify a site is up/down?
And StatusGator doesn't verify that a service is up or down, it just reports what a service reports. Most status pages have several components which are either up, down, or warn, and StatusGator aggregates that same data from all the various sources. If any component is down, that service is listed as down, etc.