| Cheops: http://www.marko.net/cheops | Tcpdump: www.tcpdump.org |
| Tripwire: http://www.tripwire.org | windump: http://netgroup-serv.polito.it/windump |
| etheral : http://www.ethereal.com | Nmap: http://www.insecure.org/nmap |
| Hpin2: http://www.hping.org | P0f: http://www.stearns.org/p0f |
| Whisker http://www.wiretrip.net/rfp/ | Nessus http://www.nessus.org |
| Sara http://www.nessus.org | COPS: http://www.fish.com/cops/ |
| Saint: http://www.saintcorporation.com/saint | GRC http://www.grc.com |