Lots of WiFi drivers released to GPL open source
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I imagine these will also eventually be ported to freeBSD, and thus pfSense…
http://digg.com/linux_unix/Linux_WiFi_Leaps_Forward -
These have been in FreeBSD's perforce for a long time but nobody has stepped up to the plate to convert all the drivers and thus get it into the tree.
I wouldn't hold my breath on this one.