Bitwarden Authenticator is a standalone app that is available for everyone, even non-Bitwarden customers.
In its current release, Bitwarden Authenticator generates time-based one-time passwords (TOTP) for users who want to add an extra layer of 2FA security to their logins.
There is a comprehensive roadmap planned with additional functionality.
Available for iOS and Android
Yeah, they’re are a few open source TOTP apps that seem pretty interchangeable. I use Authenticator Pro because it has a Wear OS integration that is handy if you have a smart watch.