Which script is freesitestatus.com using

and the others :
http://www.hyperspin.com/
http://www.servping.com
http://monitor.multicards.com/
http://www.online24.com.ar

I want to know where is it available ?

Thanks

 

I have no idea about what script they use. It's looks like more advanced scripts than any otner uptime monitoring scripts because it can notify via sms.
It's available on their reseller page http://www.hyperspin.com/en/reseller.php

 

You can also have a look at http://internetsupervision.com/. A very nice script.