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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For browny bonus points, I've looked at other proxy services like Pomerium, Envoy, and Kong, but none have exactly what I need, mainly the OAuth2 introspection authenticator. Kong has a similar one, but it bugs out. None of the other competitors offer this without writing custom http filters.