Acrylic WiFi Heatmaps might be a bit more popular than Wifi Analyzer. We know about 1 link to it since March 2021 and only 1 link to Wifi Analyzer. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I've not looked in to new apps in years, I still have access to the old free version of inSSIDer but I've also used Wifi Analyzer from farproc (Android only I believe). Cannot vouch for the quality or safety of either at this point. Source: almost 3 years ago
Take a look at Acrylic (acrylicwifi.com). Last I looked, licensing wasn't onerous. Source: over 2 years ago
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Ekahau HeatMapper - The Free Wi-Fi Coverage Mapping Site Survey Tool
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
TamoGraph Site Survey - Wi-Fi site coverage survey and modelling application
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.