SurplusMeter--formerly known as NetTracker--keeps a close eye on your bandwidth use. This utility lets you set a bandwidth limit, a start day of the month, and a connection type (such as PPP Modem or Network Card).
SurplusMeter also calculates a daily allowance and reconfigures that depending on how much you've actually used for the month. The interface is simple and uncluttered, but it also lacks the alarms and graphs found in similar Windows apps. Progress bars help track the days left in the month, the download megabyte count, and the total downloaded and uploaded, and you can easily make manual changes. SurplusMeter should appeal to any users suffering under bandwidth caps, or who just want to know how much they're downloading and uploading.