Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.
Aegis Authenticator - Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens...
LastPass Authenticator - 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.