Hello everybody! I'm studing Computer Science in Italy and for my thesis I have to present some passive vulnerability scanners, showing their features and eventually using them in my subnet. I alredy found PVS, NeVo and LAN Guard Network Security Scanner, and they are all commercial products. It would be better if I add to the list some open source and/or experimental product, but I didn't find anything. For this reason now I'm asking you, do you know any open source or experimental passive vulnerability scanner? It would be very helpful!