Google Titan - A 2FA device to protect yourself from hackers
YubiKey - The YubiKey is a one-time password device for secure login with two-factor authentication
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
Nitrokey - Email Encryption. Encrypt your emails with GnuPG, OpenPGP, S/MIME or your favourite email client.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
YubiKey NEO - Hardware-based authentication