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YubiKey

The YubiKey is a one-time password device for secure login with two-factor authentication

18 Alternatives To YubiKey

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Authenticator

Authenticator is a simple, free, and open source two-factor authentication app.

Authenticator Plus

Authenticator Plus generates 2-step verification codes and lets you synchronize your accounts.
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Authy

Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.

Azure Multi-Factor Authentication

Azure Multi-Factor Authentication helps safeguard access to data and applications while meeting user demand for a simple sign-in process.

Duo Security

Duo Security provides cloud-based two-factor authentication. Duo’s technology can be deployed to protect users, data, and applications from breaches, credential theft, and account takeover.
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FreeOTP

Open source implementation of the two-factor authentication HOTP and TOTP schemes.
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Google Titan

A 2FA device to protect yourself from hackers

Krypton

An app store for mobile blockchain games

Nitrokey

Email Encryption. Encrypt your emails with GnuPG, OpenPGP, S/MIME or your favourite email client.

OTPClient

GTK+ application for securely managing TOTP & HOTP tokens.

Obsidian - Elegant OTP Authenticator

Obsidian is an elegant OTP Authenticator app for both iOS and MacOS.

TOTP Authenticator

TOTP Authenticator app makes it easier to setup and manage your 2-factor authentication accounts and tokens. The app allows you to add extra security to your accounts and protects them from hijacking.
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andOTP

andOTP is a two-factor authentication App for Android 4.4+