Nitrokey

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

17 Alternatives To Nitrokey

AR Fidget Spinner

Fidget spinner, re-imagined in AR

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.
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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
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Instant 2FA

Add two-factor auth to any site in minutes

Invantive Authenticator

Invantive Authenticator is a two-step verification solution for use with TOTP-protected websites…

Krypton

An app store for mobile blockchain games
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OTP Auth

The app for calculating one-time-passwords on iPhone and iPad.

Obsidian - Elegant OTP Authenticator

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

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

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