TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type
Aegis Authenticator - Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens...
LoginRadius Authentication - Secure and robust authentication, SSO with user management
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
Authorizer - Authorizer is an open-source authentication and authorization solution for your applications.
OTP Auth - The app for calculating one-time-passwords on iPhone and iPad.