inSSIDer is a professional and powerful wireless network signal scanning and troubleshooting tool for Windows and Mac platforms. It can search for all Wi-Fi hotspots near your wireless device and analyze the details of each hotspot, and supports 2.4 GHz and 5 GHz dual-band search. It not only helps users view network usage, optimize network settings, troubleshoot network troubleshooting, but also is able to assist in launching wireless cracking.

I think readers who understand wireless network well know that the security of wireless network comes with congenital deficiency - i.e.: the wireless signal is easy to leak. As a result, compared with the wired network, the monitoring action made to wireless network signals is much easier. CommView for WiFi is a powerful wireless network monitor and analyzer (i.e.: packets capturing and monitoring tool) with friendly UI, industry-leading performance, good flexibility and usability. It's specially developed (by TamoSoft from New Zealand) for wireless network administrators, security specialists, network programmers, or anyone wanting to understand the wireless network communication clearly.