I'm looking for a software tool/service, preferably opensource/free, which will run on a Windows 2003 r3 standard server which will monitor bandwidth usage of all the websites it's hosting (a break down by site would be very useful) and also send out notifications if IIS or another service (as defined) stops responding. A web interface to see the bandwidth usage and other details would be very useful.
I've personally got a vps which does this kinda of monitoring but I believe this is more linked into the host itself.
Does anyone have any pointers?
All help is appriciated.