Not password managers of course, but thanks for reminding me that I should figure out how to ditch Authy.

https://github.com/BrenoFariasdaSilva/Authy-iOS-MiTM is going to be my project for the afternoon.

Google Authenticator has an export-as-QR-code function that several other authenticator apps can parse. Is it the best/most convenient implementation? Obviously not, but you can absolutely export the codes.

Notably not password managers.