Top 20 NuGet auth Packages

Package Description
This package contains classes for issuing App Service Authentication tokens. For more information, check out http://azure.microsoft.com/mobile.
Firebase authentication library. It can generate Firebase auth token based on given OAuth token (issued by Google, Facebook...). This Firebase token can then be used with REST queries against Firebase endpoints.
Elasticsearch data store adaptor for ASP.NET Core Identity.
CaveSystems Auth Bibliothek
Trimble Identity OpenId Connect Client helps you authenticate users via Trimble Identity and store user tokens. The library is cross-platform, so once you learn it on iOS, you're all set on Android.
Adds OpenId Auth Providers for use in ServiceStack Web and REST Services. Includes built-in support for Google, Yahoo, MyOpenId and Custom OpenId providers. More Info on Auth Providers: http://docs.servicestack.net/authentication-and-authorization
Adds OAuth2 Providers for use in ServiceStack Web and REST Services. Includes built-in support for Google and LinkedIn OAuth2 providers. More Info on Auth Providers: http://docs.servicestack.net/authentication-and-authorization
A useful service class that provides functionality for generating and validating JWTs.
Adds OpenId Auth Providers for use in StackExpress Web and REST Services. Includes built-in support for Google, Yahoo, MyOpenId and Custom OpenId providers. More Info on Auth Providers: https://github.com/ServiceStack/ServiceStack/wiki/Authentication-and-authorizat...
A simple library for doing social authentication in .NET Core MVC. It authenticates that people are who they say they are, but does not authorise them and has no opinion on how you store details about your users. Includes login providers for GitHub, Google, Facebook and Twitter. See the project si...
SharePoint .Net auth with Node.js
This packages contains base for initialise JWT token from file certificate or secret keys.
You can get simple informations about authenticated user
Token authentication libary includes generating JWT authentication token and optionally refreshing the token each request. Fully configurable with Token Builder
A Xamarin wrapper around Xaamrin.Auth APIs to share in Social Media(Facebook & Twitter for now)
Trimble Connect Platform Services authentication flow for desktop and mobile applications.
Provides various authenticators for user authentication in Crosslight apps, including HttpBasic, NTLM, OAuth, OAuth2, and WebAPI authenticator.
Xamarin.iOS.WeChat
Google ReCaptcha wrapper class for quick and easy validation (injectable service for ASP.NET Core apps).