SysUsage is a system monitoring and alarm reporting tool. It can generate historical graph views of CPU, memory, IO, network and disk usage, and very much more.
A tool to monitor internet hosts` bandwidth usage in a Linux-NAT network. A daemon collects data and clients display them (currently a Java applet with a graph). It automatically detects new hosts and has a nice summary statistic.
Weyland is a tool that collects information about a switched network, presents the information in a convenient format, and displays a graph of the spanning tree of the network.
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PNETPROBE is a series of Perl scripts to catch and manage tcpdump data. It uses MySQL to dump data, and uses GD::Graph for all plotting functions. This tool will be ideal to see what is flowing in how many quantities on your network.