Is there a list of devices which have been rescued or extended by open-source software?
Lyrion Music Server (formerly Logitech Media Server) is open-source server software for Squeezebox audio players, https://lyrion.org/
Tasmota is open-source firmware for ESP8266 and ESP32-based devices, https://templates.blakadder.com/preflashed-stand.html & https://github.com/tasmota
Some IP cameras have open firmware replacements.
Some Chromebooks are supported by mainline Linux.
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