Very simple SAML 2.0 consumer module for ASP.NET/C#
OAuth 2.0 social authentication providers for ASP.NET Core
OpenID Connect/OAuth2 server framework for OWIN/Katana and ASP.NET Core
A C# implementation of the OpenID, OAuth protocols
.NET standard helper library for claims-based identity, OAuth 2.0 and OpenID Connect.
OpenID Connect Provider and OAuth 2.0 Authorization Server Framework for ASP.NET 4.x/Katana
IdentityServer Access Token Validation for ASP.NET Core
ASP.NET Core Identity integration for IdentityServer4
EntityFramework persistence layer for IdentityServer4