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InfluxDB
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There is some open source firmware for very old WiFi chips:
https://wiki.debian.org/Firmware/Open#Radio
There is also some FPGA based open source WiFi chip things:
https://github.com/open-sdr/openwifi
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.