Spectrum-Tools is a set of utilities for using the Wi-Spy USB spectrum analyzer tools from Metageek LLC (http://www.metageek.net). They include userspace drivers for the hardware (implemented via libusb), a graphing UI built on GTK/Cairo, network servers for remote devices, and simple utilities for developing additional tools. This package contains the GTK user interface, spectool_gtk. Non-GUI tools can be found in the spectrum-tools-utils package.
WWW: http://www.kismetwireless.net/spectools/