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
I’m not positive but I’m assuming they’re referring to a kind of MFA where the authenticating service pushes to the client you possess rather than relying on a temporal cryptographic key. I’ve got a few services which work that way