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.
Microsoft Azure Active Directory - Azure Active Directory is a comprehensive identity and access management cloud solution that provides a robust set of capabilities to manage users and groups and help secure access to applications including Microsoft online services like Office 365 …
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Okta - Enterprise-grade identity management for all your apps, users & devices
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.