Back in August I have already posted an article which explains how complicated it is to measure the bandwidth that is actually available for you
One of the problems I mentioned was that if you want to exactly measure the available bandwidth you would have to saturate your data line and then measure the achieved bandwidth. But if you saturate your data line you are actually prohibiting all other traffic. Not a good idea for everyday life.
To support the exchange of ideas and knowledge between the users of PRTG Network Monitor - including our own labs and developers - we have created an open source platform on Google's projects hosting platform Google Code
project on Google Code will host various add-on tools for PRTG Network Monitor and their source code - created by Paessler and PRTG users.