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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.
LoginRadius Authentication - Secure and robust authentication, SSO with user management
Authpack - Complete user auth system installed with 8 lines of code.
Authentication - A strong Multi-Factor authentication (MFA) solution with advanced biometrics.
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.