Trialware.
From Lifehacker (old version): "Leopard's built-in Airport utility doesn't do much except show you what Wi-Fi networks are nearby, and which require a password—but free utility AirRadar does much more. AirRadar detects available Wi-Fi networks (in my case, more networks showed up in AirRadar's list than in Leopard's default menubar drop-down), and displays more information like signal strength, last seen timestamp, channel, signal average, max, and min. Disconnect from networks without turning off your Airport card, get Growl notifications, and set the scan interval with AirRadar too. You can even save networks as favorites, instead of just hopping onto any old open network by default. If you've got a spotty signal you'll appreciate AirRadar's signal to noise line graphs, too. AirRadar is a free download for Mac only."
A collection of research on the effects of non-ionizing EMF on biology. This is not necessarily meant for people with Environmental Illness (MCS+EHS) specifically, but to demonstrate that electromagnetic pollution is harmful to everyone — every living organism. There have been thousands of studies over the years, but I haven't found a very comprehensive, digestible database for the research. Needless the say, with the amount of radiation we're exposed to on a daily basis and prospect of global WiFi around the corner, the findings are grim.
Workshop to create a sensor application over a WiFi Mesh network - GitHub - binnes/WiFiMeshRaspberryPi: Workshop to create a sensor application over a WiFi Mesh network