Top 20 NuGet authentication Packages

Implementation of Microsoft.AspNetCore.Authentication for Exact online
Imitates a SonicWALL appliance for development of an external authentication server (captive portal).
Efuelite Solutions CookieHandler package helps developers to set, get and clear cookie in web applications. It also auto encrpyt the cookie and decrypt the cookie to ensure security.
A wrapper library for Mojang API. Used to authenticate user, manage skins and getting data such as statistics, profiles, and API status.
ASP.NET Core extensions making OAuth2 authentication easier to use.
.NET SPID SDK Usefull library to connect to Italian Identity Provider using SPID
SPID authentication, SAML2 compliant.
Simple ASP.NET 5 middleware that allows for hard-coding claims and automatically authenticates the user to simplify local development.
The official ASP.NET Identity Provider for Couchbase Server.
ASP.NET Core security middleware enabling VidZapper authentication.
AngularJS starter kit Spa secured server
AngularJS starter kit Spa
SDK for accessing LaunchKey V3 endpoints.
This package, built on top of the original Active Directory Authentication Library (ADAL), makes extremely easy to authenticate users inside your Xamarin projects. You only need 1 line of code!
Authenticate clients in C# using Butterfly.Db and Butterfly.Web
Advanced implementation of the Authentication filter and Authorization attribute for WebApi utilization.