BitMeter is a free bandwidth meter. With the help of BitMeter you can visually monitor your internet connection. It displays a scrolling graph that shows your upload and download speed over time. The data is updated every second, and the current speeds are also displayed numerically for your convenience.
With the help of BitMeter you can also monitor your monthly data transfers. Just enter details of your monthly quota, and BitMeter will warn you when you approach your limit. Apart from all these BitMeter has got more than 80 options for you to tweak.