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nf_quota is an ip-based traffic accounting project. IPs can be added to users. It provides a kernel module that hooks onto netfilter and counts every packet passing a specified interface. If the quota for a ip/user is exceeded, the packet is dropped.
riman - Router Interface Monitor And Notify
NOTE: riman development has ceased, since I discovered Nagios, which does pretty much everything I had in mind for riman :)
riman is composed of perl and php scripts that monitor routers via snmp.