Zoho OneAuth - Secure your Zoho Account with easy-to-use, multi-factor authentication. Because hackers won't give you a second chance.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
FreeOTP - Open source implementation of the two-factor authentication HOTP and TOTP schemes.