- Wireshark : Sniffing the glue that holds the Internet together
- Kismet : A powerful wireless sniffer
- Tcpdump : The classic sniffer for network monitoring and data acquisition
- Cain and Abel : The top password recovery tool for Windows
- Ettercap : In case you still thought switched LANs provide much extra security
- Dsniff : A suite of powerful network auditing and penetration-testing tools
- NetStumbler : Free Windows 802.11 Sniffer
- Ntop : A network traffic usage monitor
- Ngrep : Convenient packet matching & display
- EtherApe : EtherApe is a graphical network monitor for Unix modeled after etherman
- KisMAC : A A GUI passive wireless stumbler for Mac OS X
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