One more step to unhitching from Google…
Right now the only option I see in F-Droid is Aegis.
I’m not sure what to actually look for side from checking for unexpected permissions and reasonably frequent updates.
Hopefully something I can sync with a GNOME app…
Yubikey. It supports TOTP as well as passkeys. Plus is a physical device separate from my phone. Recommend getting 2 to have 1 as backup