AspNet.Security.OAuth.Providers

Social login for ASP.NET Core, solved as a NuGet package. AspNet.Security.OAuth.Providers is a collection of middleware covering GitHub, Twitter/X, Dropbox, and dozens of other OAuth providers, so sign-in-with-anything becomes a few lines in your startup code instead of a hand-rolled OAuth dance. Free and open source.

There's nothing to host. Each provider ships as its own package, so you install only what you use, and configuration is a client ID plus a secret. Kevin Chalet (the OpenIddict author) and Martin Costello maintain it actively, which matters more than usual for security middleware.

The maintainers themselves point new applications toward the OpenIddict client, which handles the same providers plus full OpenID Connect. Existing ASP.NET Core apps that just need social sign-in are still well served here. Full identity platforms like Authentik (goauthentik/authentik) or Keycloak (keycloak/keycloak) solve a different, bigger problem.

The catch: this is auth middleware, not user management. Accounts, sessions, roles, and MFA are still your job, and for greenfield projects the maintainers' own advice is to start with OpenIddict instead.