Proton has a free new authenticator apps, which is available cross-platform with end-to-end encryption protection for data.

Microsoft Authenticator is a free mobile authenticator app that provides secure sign-in for mobile accounts using multi-factor authentication (MFA) methods like time-based one-time passwords ...

An easily accessible option that excels at the basics Google Authenticator is one of the most popular options out there -- the app ties directly into your Google Account and is available across ...