OnlyKey - OnlyKey is an open source alternative to YubiKey
Google Titan - A 2FA device to protect yourself from hackers
SoloKeys - Secure login made open and easy 🔒
Nitrokey - Email Encryption. Encrypt your emails with GnuPG, OpenPGP, S/MIME or your favourite email client.
YubiKey - The YubiKey is a one-time password device for secure login with two-factor authentication
YubiKey NEO - Hardware-based authentication