Healthchecks.io looks really interesting, both because it's an open source django project and because I was disappointed with Dead Man's Snitch. DMS forces me to live within their timing for running checks -- If you have something that has to occur @ 3am every morning, you won't know it failed until midnight UTC later that day, or when a customer calls to complain.

Healthchecks handles this a lot more sensibly. I might throw it on a linode and give it a shot. Thanks for releasing it.