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
Does it have any killer features in favor of using the free app of an for-profit company instead of an established FOSS app?
Bitwarden apps have been open source since the beginning, mobile + backend + web