The Best USB Wi-Fi Adapters | Reviews by Wirecutter
TP-Link [TL-WN722N] 150Mbps High Gain Wireless USB Adapter | AllOnline
Comparing WiFi Adapters | leJOS News
Amazon.com: Edimax EW-7811Un 150Mbps 11n Wi-Fi USB Adapter, Nano Size Lets You Plug it and Forget it, Ideal for Raspberry Pi / Pi2, Supports Windows, Mac OS, Linux (Black/Gold) : Electronics
It seems that tp-link TL-WN725N ver: 3.0 does not work in 6.6 : r/openbsd
The Best USB Wi-Fi Adapters | Reviews by Wirecutter