A bandwidth meter, monitor, and traffic controller: measures, displays, and controls all traffic to/from your computer or on your network. Analyzes the data packets: where they come from, where they go, which port and protocol they use (this makes it possible to distinguish between local and Internet traffic for example).
BWMeter can also be used for traffic control by setting a speed limit for all kinds of connections or restricting access to certain internet sites. It creates statistics for all computers in your network, measuring and displaying all LAN traffic as well as download / upload from the Internet. You can even define filters which show your transfer with certain internet addresses (e.g., to see how much data you download from your favorite news server).