netflow and sflow analyzer

Scrutinizer is a network monitoring tool that allows users to analyze network traffic using NetFlow and sFlow. Scrutinizer diagnoses traffic congestion by displaying which hosts are using the most bandwidth and what applications they are using.

high performance data logging and graphing system

RRDtool is the OpenSource industry standard, high performance data logging and graphing system for time series data. Use it to write your custom monitoring shell scripts or create whole applications using its Perl, Python, Ruby, TCL or PHP bindings.