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YubiKey - The YubiKey is a one-time password device for secure login with two-factor authentication
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.
Nitrokey - Email Encryption. Encrypt your emails with GnuPG, OpenPGP, S/MIME or your favourite email client.
Myki Authenticator - Login to any account on any device with your fingerprint
SoloKeys - Secure login made open and easy 🔒
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.