Ravio used to be the popular choice but recently it got acquired by Mobime [0], so I am looking for alternatives.
2FAS: Seemed like a good open source app, but looks like it lacks E2EE [1]
Ente is another one that I am looking at.
What is everyone using?
[0] - https://github.com/raivo-otp/marketing-website/issues/19
[1] - https://discuss.privacyguides.net/t/add-2fas-authenticator-app/12958/35
Now I've mostly transitioned to using the built in OTP handling in Keychain. Every so often I find one I haven't migrated across yet.
Another option is HE's NetWork Tools iOS app, which also has an OTP Authenticator in it. I believe it's a lot less integrated though (I don't think it provides a browser plugin, for example).