Okta ASP.NET middleware enables OAuth 2.0/OIDC authentication and authorization for ASP.NET and ASP.NET Core applications.
okta-aspnet
Flexible and versatile OAuth 2.0/OpenID Connect stack for .NET
[Archived] ASP.NET Core Identity is the membership system for building ASP.NET Core web applications, including membership, login, and user data. Project moved to https://github.com/aspnet/AspNetCore
An authorization library that supports access control models like ACL, RBAC, ABAC in .NET (C#)
OpenID Connect/OAuth2 server framework for OWIN/Katana and ASP.NET Core
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