Bandwidth Monitor and Rate Estimatorhttp://www.infradead.org/~tgr/bmon/
bmon is a portable bandwidth monitor and rate estimator. It supports various
input methods for different architectures. Various output modes exist,
including an interactive curses interface, lightweight HTML output, and simple
ASCII output. Statistics may be distributed over a network using multicast or
unicast and collected at some point to generate a summary of statistics for a
set of nodes.