Darkstat is an ntop-workalike network statistics gatherer. Built to be faster and smaller than ntop, it uses libpcap to capture network traffic and serves up Web page reports of statistics such as data transferred by host, port, and protocol. It also has a neat bandwidth usage graph.
You can download it from the following link: https://packetstormsecurity.com/files/download/26190/darkstat-1.3.tar.gz
Source: https://packetstormsecurity.com/files/26190/darkstat-1.3.tar.gz.html