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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Are there any UI examples that implement OIDC registration flow?

The example "selfservice-ui" does implement OIDC sign-up, linking, and logins.  <https://github.com/ory/kratos-selfservice-ui-node>  Once the OIDC config for (Google, Github, Apple, etc) are defined in the config, the Self-Service UI will provide the necessary form-buttons.