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Multi Router Traffic Grapher or MRTG is free software for monitoring the traffic load on network links.

Some of MRTG's Features

• Measures 2 values (I for Input, O for Output) per target.
• Gets its data via an SNMP agent, or through the output of a command line.
• It can be configured to collect data on a user defined interval.
• Creates an HTML page per target that features 4 graphs (GIF or PNG images).
• Results are plotted vs time into day, week, month and year graphs, with the Input plotted as a full green area, and the Output as a blue line.
• Automatically scales the Y axis of the graphs to show the most detail.
• Adds calculated Max, Average and Current values for both Input and Output to the target's HTML page.
• It can use a Round-Robin database to minimize the amount of data collected.
• Can also send warning emails if targets have values above a certain threshold.