Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
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.
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.
privacyIDEA - privacyIDEA is an enterprise ready, open-source multi factor authentication system.
Ping Identity - Ping Identity provides cloud-based, single sign-on and identity management solutions with their SAML SSO.