- https://github.com/bastibl/gr-ieee802-11 (gnuradio transceiver by the amazing Bastian Bloessl)
- https://github.com/open-sdr/openwifi (efforts to make a low-cost SDR Wi-Fi transceiver)
From my point of view, cool projects, all the hardware I have access to is closed source and sometimes I really wish I could just change some low level parameters in my Wi-Fi cards.