Update: I wrote my own (https://www.emogic.com/tech-notes/authenticator-anywhere/), but the following text is still accurate.
I really like this TOTP (Timed Based Onetime Password) Authentication App.
Once entered, you can easily export your settings in bulk in a json file (so you should turn on encryption), export them individually via URI or individually using a QR code.
Once backed up you can import them in bulk or individually on another device, a desktop app (https://github.com/Sammy-T/avda/releases)
Authy no longer supports desktop apps, nor does it have an export feature.
The export feature is really handy as I can have the same TOTP on multiple devices and using different apps. Eg: Bitwarden, Google Auth, MS Authenticator Aegis, anything that supports TOTP
It truly makes your Authentication portable. Authy is close, but not like this!
With portability comes responsibility. Therefore having a strong encryption database is a must.
https://www.bentasker.co.uk/posts/blog/general/switching-to-aegis-for-totp-codes.html