Name: FreeOTP
Category: One-Time pad/2FA
URL: https://freeotp.github.io/
As per this comparison:
https://blog.devolutions.net/2017/8/updated-most-popular-2-factor-authentication-2fa-compared
Still looking into it's privacy aspects.
andOTP seems to be more actively maintained, and is more feature-rich. I personally use this.
Tofu and OTP Auth are great iOS 2FA clients.
Discussion should continue in #420. Thanks for the suggestion.