Note: SurplusMeter has ceased development and the developer does not provide support.
SurplusMeter... SurplusMeter is a handy tool for broadband users who have a monthly download limit. SurplusMeter measures your Internet connection's download and upload traffic and keeps track of your traffic volume. It provides useful output statistics such as daily allowance, average daily usage and accumulated surplus. SurplusMeter is free-of-charge and available under the GNU General Public Licence.