Other Sniffing Tools

Ettercap is an open source software tool for computer network protocol analysis and security cracking. It can be used to intercept traffic on a network segment, capture passwords, and conduct man-in-the-middle attacks against a number of common protocols.
dSniff is a packet sniffer and set of traffic analysis tools. Unlike tcpdump and other low-level packet sniffers, dSniff also includes tools that decode information (passwords, most infamously) sent across the network, rather than simply capturing and printing the raw data, as do generic sniffers like Ethereal and tcpdump.
AiroPeek was the first Wi-Fi (IEEE 802.11) packet analyzer, or packet sniffer, that provides network engineers with a view of the data traversing a Wireless LAN network. AiroPeek was created in 2001 and its interface was based closely on EtherPeek, another product from WildPackets, Inc. They also have some “free” utilities.

Ettercap is an open source software tool for computer network protocol analysis and security cracking. It can be used to intercept traffic on a network segment, capture passwords, and conduct man-in-the-middle attacks against a number of common protocols.