Tested with the following apps:
- FreeOTP Authenticator (open source) Availabe via F-droid, Google Play, and Apple's App Store
- OTP Authenticator (open source) Availabe via F-Droid and Google Play. It features a built-in QR-code reader.
- Google Authenticator (proprietary)
- KeePassXC (Linux, Windows, macOS) (open-source) Available via download, package repositories or GitHub (Keepass also provides a plugin and Keepass2Android allows to use TOTP token)
- SailOTP (SailfishOS) (open source) Available via JollaStore or Openrepos.net
- OTP Auth (proprietary) Availabe via Apple's App Store
Once you enable OTP with Two Factor Totp, your aplications (for example your Android app or your GNOME app) will need to login using device passwords. To manage it, know more here