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Hydro Mobile App - Free, instant, scalable, blockchain-based 2FA security
TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type
Authorizer - Authorizer is an open-source authentication and authorization solution for your applications.
PropelAuth - PropelAuth hosts and manages your authentication.
Rapid 2FA - A painless way to add two-factor authentication to your site
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.