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Aegis Authenticator - Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens...
Twilio - Brings voice and messaging to your web and mobile applications.
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
Sinch - Sinch is a powerful voice and messaging SDK that lets you bring your apps to life with VoIP and...