WiFi And Network Analyzers For Windows And Mac?

When taking the IPVM IP Network course a few years ago two analyzers were introduced to me, PTRG and InSSIDer. Both were free to download. I found InSSIDer to be easy to use, but now it seems to have been discontinued. What are people using today? I have a Wifi speed analyzer app on my phone but I'm looking for analytics to determine channel traffic over 2.4Ghz.

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