NeTAMS is a Network Traffic Accounting and Monitoring Software. 
It runs as a daemon under FreeBSD and Linux operating systems. 
Collects an IP traffic information flowing via your PC/UNIX or Cisco router, 
filters it, aggregates, stores onto HASH/SQL database, 
and makes SMTP/HTML reports to site administrator.
Anoter features are flexible policy targets, firewalling, access control,  
quotas, scheduler and much much more.

WWW: http://www.netams.com/