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Google Authenticator
Software
Google Authenticator is a software-based authenticator by Google. It implements multi-factor authentication services using the time-based one-time password and HMAC-based one-time password, for authenticating users of software applications. Wikipedia
Developer(s): Google
Initial release: September 20, 2010; 13 years ago
License: Proprietary freeware (some versions were under Apache License 2.0)
Operating system: Android, iOS, BlackBerry OS, Wear OS
Platform: Mobile
Repository: github.com/google/google-authenticator