WirelessNetView – Wireless Network Monitoring Tool
WirelessNetView is a small utility that runs in the background, and monitor the activity of wireless networks around you. For each detected network, it displays the following information: SSID, Last Signal Quality, Average Signal Quality, Detection Counter, Authentication Algorithm, Cipher Algorithm, MAC Address, RSSI, Channel Frequency, Channel Number etc.
Wirelessnetview is a really simple application which run directly without installing you just download its .zip file and start using it you can know a couple of important things about active connections which can help you monitoring them if you are admin or help you connecting with them knowing which is good for you if they are open networks it also tells you which connection is open for everyone and which is not.