Top 20 NuGet authorization Packages

Official Okta middleware for ASP.NET Core 2.0+. Easily add authentication and authorization to ASP.NET Core applications.
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.
Microsoft Identity based authentication and authorization service for .NET MVC Apps.
Official Okta middleware for ASP.NET 4.5+. Easily add authentication and authorization to ASP.NET applications.
Simple Oauth2 client.
Helper library for claims based identity & access control in ASP.NET Web API v2.
OWIN middleware for doing claims transformation in OWIN/Katana applications.
Middleware for doing claims transformation in OWIN/Katana applications.
ASP.NET Core types and middlewares to accept tokens from Azure B2C and Azure AD tenants. For more info, see the project url
Provides capabilities to query Microsoft Azure Management Authorization.
Backport of Asp.Net core's policy based authorization to Asp.Net 4.
Backport of Asp.Net core's policy based authorization to Asp.Net 4 WebApi 2
AccessControlHelper for asp.net mvc and asp.net core apps
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 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.
Web API intgration package for resource/action based authorization.
OWIN middleware for providing a resource/action based authorization manager.