he Usage Agent toolset is designed to help manage your ISP data usage without having to log into your ISP usage page. It can optionally monitor your network card throughput and produce reports on usage.
It's released under the GNU General Public License. Take a look and see if it suits your needs.
Usage Agent now works for the following ISP's:
Optus, Telstra/Bigpond, aaNet, Exetel, Exetel Wireless, AAPT, OntheNet, g-node, amnet, dodo, EFtel, Internode, ComCen, Westnet, Spin, BettaMomentum, Adam, Netspace, TPG, Blitz, Soul, Webshield.

The license of this software is Freeware, you can free download and free use this ip utility software.