If your internet service provider limits your broadband, SurplusMeter is useful tool to monitor your levels and make sure you never go over. The program offers a clear interface window, from which you can set the type of connection you have, download limit in bytes and month you want to start the analysis on. The bottom part of the application serves to show all the stats that SurplusMeter is catching like megabytes left, accumulated surplus, daily usage or days left in month. Thanks to three progress bar, you also have a representation of days left, megabytes downloaded and uploads and downloads.
If you go into the preferences menu you'll be able to even add or remove bytes, to make sure you're monitoring the correct amount of bandwidth. You can also decide to clear stats completely and start from zero by clicking reset. This is quite useful after a while, as it can get confusing as to how much bandwidth you've been using.
SurplusMeter is a useful tool to monitor all stats on your broadband bandwidth usage.