The U2F Garden

Nitrokey

Nitrokey is a Berlin based vendor that has built its reputation on open hardware and open source firmware. Their current generation is the Nitrokey 3, which uses a Common Criteria EAL6+ certified secure element and supports FIDO2, U2F, OpenPGP smart card, PIV, OATH, and a broad set of cryptographic primitives including secp256k1. The newer Nitrokey Passkey is a simpler, FIDO only device that replaces the older Nitrokey FIDO2 line.

Nitrokey 3

Nitrokey’s open source flagship. FIDO2 with NFC plus a full OpenPGP and PIV smart card stack.
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Certified by the FIDO Alliance as conforming to FIDO2 standardsSupports Hashed One-Time-Password generationSupports WebAuthn discoverable resident credentials, the building block of passkeysConforms to PKCS11 SmartCard interface standardsSupports Time-based One-Time-Password generationConforms to the U2F Authenticator and WebAuthn standard

Nitrokey Passkey

A simple FIDO only Nitrokey for users who want a passkey holder without the full Nitrokey 3 protocol stack.
More information
Certified by the FIDO Alliance as conforming to FIDO2 standardsSupports WebAuthn discoverable resident credentials, the building block of passkeysConforms to the U2F Authenticator and WebAuthn standard