Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
Aegis Authenticator - Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens...
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
AWS Certificate Manager - AWS Certificate Manager from Amazon Web Services (AWS)
OTP Auth - The app for calculating one-time-passwords on iPhone and iPad.
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.