Alternatives to Google Authenticator for all platforms with any license

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Google Authenticator Comments

Use the free and open source FreeOTP instead.

Comment by JohnFastman
about Google Authenticator and FreeOTP, Authy · Mar 2017 · Helpful Not helpful 5 Helpful Report as spam

If you could have exactly the same functionality as Google Authenticator or Authy but using open source software, you should prefer it for reasons of transparency and security, at the very least. That's what FreeOTP offers. Please use it instead of Google Authenticator or Authy. There's no need to have proprietary code in matters of security, and particularly not in this case.

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