Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
Velix.ID - Frictionless Identity verification through Blockchain
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.
NoPass.me - Open-source identity verification
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Identance - A tool to identify and verify your users