Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
OneLogin - On-demand SSO, directory integration, user provisioning and more
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.
Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
Keeper for Business - Keeper is the leading cybersecurity platform for preventing password-related data breaches and cyberthreats