There is also Aegis[1]. It's FOSS and available in F Droid and Play Store. Authy is pretty good, but doesn't support export of the secrets used for TOTP, whereas Aegis supports export to json and GPG encrypted json.

I've been using Authy for a few years, but switched to Aegis about three years ago and couldn't be happier. Since Authy doesn't support direct export of the secrets, I've had to use a workaround [2].

[1] https://getaegis.app/ [2] https://gist.github.com/JacobJohansen/5f688d45049be440b8ee87...