GitHub repository: swisscom/kratos
Description: Next-gen identity server (think Auth0, Okta, Firebase) with Ory-hardened authentication, MFA, FIDO2, profile management, identity schemas, social sign in, registration, account recovery, service-to-service and IoT auth. Can work as an OAuth2 / OpenID Connect Provider. Golang, headless, API-only - without templating or theming headaches.