MetaGeek
MetaGeek Pro = $200/yr
https://my.metageek.com/checkout?plan=pro&billing=annual
https://www.metageek.com/support/downloads/
TamoSoft
TamoGraph Site Survey (bundle with wifi adapters) $1949 https://www.tamos.com/order/special.php
TamoGraph Site Survey (Windows/Mac) $999/1399 https://www.tamos.com/products/wifi-site-survey/
CommView Network Analyzer (LAN) (Windows) $299+149 https://www.tamos.com/products/commview/
CommView Network Analyzer (WIFI) (Windows) $499+199 https://www.tamos.com/products/commwifi/
SmartWhois (Windows) $39 https://www.tamos.com/products/smartwhois/
Essential NetTools - Network & System Toolkit (Windows) https://www.tamos.com/products/nettools
Throughput Test - WLAN Performance Meter (Windows/Mac/Android/iOS) https://www.tamos.com/products/throughput-test
NetSpot
NetSpot (free) (Windows/Mac/Android) https://www.netspotapp.com/downloads.html
NetSpot $49/149 https://www.netspotapp.com/netspotpro.html
FreeDownloads: