CommView for WiFi is a network monitor and packet analyzer for 802.11 a/b/g networks. Real time statistics, on-the-fly WEP and WPA decryption, over 70 supported protocols. Windows 2000/XP/2003/Vista.
Category:   Software > Monitoring/Scanning

AP Scanner is a small Macintosh-only application that will detect all in-range open 802.11 wireless network access points. It will show you a pretty little graph and show potential channel conflicts.
Category:   Software > Monitoring/Scanning

Locate and connect to WLAN or Wi-Fi networks automatically for Windows 98/Me/2000/XP
Category:   Software > Monitoring/Scanning

AirFart listens for 802.11 traffic and reports signal strengths in real time for all wireless devices it hears; this information is displayed in a GTK based GUI. AirFart requires that the linux-wlan-ng project be installed.
Category:   Software > Monitoring/Scanning

wavemon is a ncurses-based monitoring application for wireless network devices. It currently works under Linux with devices that are supported by the wireless extensions by Jean Tourrilhes (included in Kernel 2.4 and higher), e.g. the Lucent Orinoco cards.
Category:   Software > Monitoring/Scanning