andOTP - andOTP is a two-factor authentication App for Android 4.4+
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.
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.
OTP Auth - The app for calculating one-time-passwords on iPhone and iPad.