Hardware
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Phones
danger
There is an international law that forbids to open-source firmwares for any GSM modem. Moreover there are usually more binary blobs in the phone GPU, WiFi, BT, etc and Android is not reproducible neither debootstrappable. Whenever you buy a mobile phone you are not the owner of it, because you are not able to fully control it!
https://mobile.nixos.org/devices/index.html
https://download.lineageos.org/
https://replicant.us/supported-devices.php
PC
https://www.raptorcs.com/content/base/products.html
https://www.sifive.com/boards/hifive-unmatched
Laptops
http://opensource.rock-chips.com/wiki_Boot_option
https://www.pine64.org/pinebook-pro/
Routers
https://librecmc.org/fossil/librecmc/wiki?name=Supported_Hardware
SBC
http://linuxgizmos.com/99-sbc-runs-linux-on-risc-v-based-allwinner-d1/
https://beagleboard.org/beaglev