Very few are actually open-source, only ones I can think of are:
nostr:npub1s0vtkgej33n7ec4d7ycxmwt78up8hpfa30d0yfksrshq7t82mchqynpq6j
Trezor
Shift Crypto BitBox (haven't used myself)
SeedSigner as well!
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#[6] Jade no?
