The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network-links. MRTG generates HTML pages containing graphical images which provide a LIVE visual representation of this traffic. Check http://www.ee.ethz.ch/stats/mrtg for an example. MRTG is based on Perl and C and works under UNIX and Windows NT.
You can download it from the following link: https://packetstormsecurity.com/files/download/29906/mrtg-2.9.25.tar.gz
Source: https://packetstormsecurity.com/files/29906/mrtg-2.9.25.tar.gz.html