Top 20 NuGet authorization Packages

The Authorization Bundle extend RavenDB and add document level permissions. The Auth Bundle allows to define permissions for a specific user, a group or using arbitrary tagging. The system is design to be high performance, scalable and flexible.
RavenDB 'Authorization' bundle client extend RavenDB and add document level permissions.
ASP.NET Core authorization classes. Commonly used types: Microsoft.AspNetCore.Authorization.AllowAnonymousAttribute Microsoft.AspNetCore.Authorization.AuthorizeAttribute This package was built from the source code at https://github.com/aspnet/Security/tree/93926543f8469614c2feb23de8a8c0561b8b2463
ASP.NET Core authorization policy helper classes. This package was built from the source code at https://github.com/aspnet/Security/tree/93926543f8469614c2feb23de8a8c0561b8b2463
Helper library for claims based identity & access control in OWIN/Katana based applications.
Helper library for claims based identity & access control in ASP.NET Web API v2.
Middleware for doing claims transformation in OWIN/Katana applications.
A middleware for authentication with badge for asp net core
Helper library for identity & access control in .NET 4.0/WIF and .NET 4.5 (includes MVC4 and Web API support).
Helper library for claims based identity & access control in .NET.
OWIN middleware for providing a resource/action based authorization manager.
Some authorization filters for Hangfire's Dashboard.
AccessControlHelper for asp.net mvc and asp.net core apps
Official Okta middleware for ASP.NET 4.5+. Easily add authentication and authorization to ASP.NET applications.
Web API intgration package for resource/action based authorization.
Ocelot Security Authorization Token Blacklist EntityFramework Storage
An NHibernate IUserAuthRepository to persist User registration and authentication info in any RDBMS NHibernate supports. Implements ServiceStack's built-in AuthProvider Model: http://docs.servicestack.net/authentication-and-authorization inc. Twitter, Facebook, Basic, Digest,...
.NET Client Library for PolicyServer Runtime API
Official Okta middleware for ASP.NET Core 2.0+. Easily add authentication and authorization to ASP.NET Core applications.
free OSS version of PolicyServer