The Network Statistics Daemon (NStats) is a GPL network data/network metrics graphing tool. It presents it's information via and HTTP interface. It's based in part on the Opensource work of NTOP by Luca Deri.
System Requirements
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP/Vista/7), Windows 95/98/ME, Windows NT/2000, Windows XP