I found an very interesting http monitoring tool called Uptime using node.js and mongoDB. I directly installed Uptime on one of my Linux servers and from the first look I find it really cool 🙂 before you start you need to get node.js and mongoDB installed on your server and the rest is then very easy.
Ones the Uptime is running you can access the web interface and create the first checks, here some screenshots:
Here you create your http checks and define some settings:
Detailed check overview with graphs:
If you are interested then have a look here: http://fzaninotto.github.com/uptime/