Top 20 NuGet oauth2 Packages

Provides OAuth2 login support for various external sites.
gRPC library compatible with .NET Core. Currently, the Grpc NuGet package doesn't support .NET Core. This package supplies a version which runs on .NET Core that is experimental and in-development.
Utility to help with OAuth2 Authentication for HttpClient.
Anonymous token support for IdentityServer4
Package to bootstrap IdentityServer4 SSO
A Library for desktop application to get the OAuth 2.0 Access Token for Intuit Partner Platform (QuickBooks Online) Rest APIs.
Package Description
IdentityServer3 Access Token Validation Integration Library for ASP.NET Core
Core classes
This package provides an assembly containing classes which extend the .NET Framework 4.5 with the necessary logic that extends token validation to check that the signer of a token and the issuer of the token are a valid pair. This capability can be applied both within the Windows Identity Foundation...
Enables securing of WebAPIs using OAuth2 Client Credentials Grant - See https://dev.twitter.com/docs/auth/application-only-auth
OAuth2 Authorizer helps get the access token for any REST API that implements 3-legged OAuth2 authorization.
Simple OAuth2 client for Facebook, Google and Live
Portable Client Library and HttpClient based OAuth library, including all platform(for PCL as .NET 4.0, .NET 4.5, Silverlight4, Silverlight5, Windows Phone 8.0, Windows Store Apps). This is an independently uploaded package and has source code from various sources aggregated under MIT License. Ori...
A lightweight library for OAuth2 authentication. Built inn support only for Facebook yet, but available functionality to add custom providers.
Package Description
Oauth2.0 Client