Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Yes - Hydra is an OAuth 2.0 and OIDC provider.

Kratos is an identity management system that takes care of many acccount management and account flows for you (including OAuth2 &amp; OIDC for *external* providers). There's support for 2FA since 0.8 so it sounds like it might fit your use case

The two are not mutually exclusive :)

Right it's the external part. If it could be the provider, that would work.

I do still need to refresh my knowledge on OAuth.