Aegis Authenticator★★★★★A well-designed 2FA app for Android that lets you organize accounts into groups, can use a password or fingerprint to add another layer of security to your codes, and can easily import from several apps including Google Authenticator.
FreeOTP (Authenticator)★★★½☆Extremely bare-bones 2FA app for iOS and Android, sponsored by Red Hat. It’s secure, works offline, and doesn’t depend on Google. A decent choice if you start with it, but a lack of import features means switching from another app is tedious.