[j_s]

This came up last week on the OpenPGP discussion; here's a re-post -- no one else has mentioned the sc4-hsm yet. https://news.ycombinator.com/item?id=14495213

Open source (-ish?) Yubikey alternatives

https://sc4.us/hsm/ $75 | https://news.ycombinator.com/item?id=12053181

https://trezor.io/ $99 | https://news.ycombinator.com/item?id=10795087 (not much on HN)

https://www.floss-shop.de/en/security-privacy/smartcards/13/... €16.40 (OpenPGP Smart Card v2.1; 4096-bit keys)

https://www.fidesmo.com/fidesmo/about/privacy-card/ €15 (NFC only; recommended by the terminated SIGILANCE OpenPGP Smart Card project; 2048-bit keys)

[noja]

Fixed link: https://www.floss-shop.de/en/security-privacy/smartcards/13/...

[MichaelGG]

It's a bit offputting that the SC4 calls itself a "hardware-secure module" which seems to be a unique term (vs hardware security module).