Applications which are used by security professionals (and hackers alike) to test the security of their networks and scan for vulnerabilities now have the capability to run independently from a USB flash drive and no longer require that WinPCap or other third-party packet capture drivers to be installed on a system. Applications such as Nmap, Ethereal, Showtraf, TCPDump, Nemesis and John the Ripper are now appearing online via sites in a modified form that contain an internal packet driver that is loaded when the application is launched.

• Nmap


• Ethereal


• Showtraf


• TCPDump


• Nemesis


• John the Ripper


• Netpass


• Slurp

For the full list : List of hacking applications that run on USB flash drive