Kalibrate, or kal, can scan for GSM base stations in a given frequency band and can use those GSM base stations to calculate the local oscillator frequency offset.
KillerBee is a Python based framework and tool set for exploring and exploiting the security of ZigBee and IEEE 802.15.4 networks. Using KillerBee tools and a compatible IEEE 802.15.4 radio interface, you can eavesdrop on ZigBee networks, replay traffic, attack cryptosystems and much more.
Kismet is an 802.11 layer-2 wireless network detector, sniffer, and intrusion detection system. It will work with any wireless card that supports raw monitoring (rfmon) mode, and can sniff 802.11a/b/g/n traffic. It can use other programs to play audio alarms for network events, read out network summaries, or provide GPS coordinates.