Wardriving

Wardriving is the act of searching for Wi-Fi wireless networks by a person in a moving vehicle, using a portable computer or PDA.

Software for wardriving is freely available on the Internet, notably

NetStumbler for Windows,

Kismet or SWScanner for Linux, FreeBSD, NetBSD, OpenBSD, DragonFly BSD, and Solaris, and KisMac for Macintosh.

There are also homebrew wardriving applications for handheld game consoles that support Wi-fi, such as sniff_jazzbox for the Nintendo DS, Road Dog for the Sony PSP and Stumbler for the iPhone. There also exists a mode within Metal Gear Solid: Portable Ops for the Sony PSP (wherein the player is able to find new comrades by searching for wireless access points) which can be used to wardrive.