Top 20 NuGet auth Packages

Net Auth Client Loader
Middleware for your Owin pipeline that allows an application to perform authentication of requests via an API key in the Authorization header.
ECL.Auth.HMAC module
ECL.Auth.HMAC.Web module
Role provider to work with Forms Authentication web projects
Authentication database service using roles
Session Service for Variel Authentication Systems
This package provides the capability for you to authenticate users and manage their identities. You can also leverage user identities in other App Center services.
Xamarin.iOS.WeChat without payment
Easily validate Auth0 tokens within an Azure Function.
Lightweight, Fast JWT(JSON Web Token) implementation for .NET Core.
Data Contracts for (de)serialize ISO20022 XML messages
An authentication handler for HttpClient.
a simple auth provider (non standard) to deploy on azure functions