MRTG

The best part about this software is that it gives you hourly, weekly ,monthly and yearly reports as well. View them as you like..

If one is in the ISP business then you could put the results on the webserver itself for the customers to view their usage.....of course each one gets to view their own graphs only.

There is also a commercial sort-of MRTG called PRTG by a chap called Paessler. For those who can't or don't want to get their heads around the MRTG configuration or who want a native Windows product at quite a rerasonable price then PRTG is worth a look

According to this article in tech republic, techrepublic.com.com/5100-10586-5649280.html?tag=nl.e115 PRTG is limited to the number of nodes it can monitor where as MRTG does not seem to have any limits.

thanks for the nice helpful link.

The Multi Router Cartage Grapher (MRTG) is a apparatus to adviser the cartage amount on arrangement links. MRTG generates HTML pages absolute PNG images which accommodate a LIVE beheld representation of this traffic. MRTG consists of a Perl Software which uses SNMP to apprehend the cartage counters of your routers and a fast C affairs which logs the cartage abstracts and creates admirable graphs apery the cartage on the monitored arrangement connection.