Top 20 NuGet oauth2 Packages

Helper library for claims-based identity, System.IdentityModel, JSON Web Tokens, OAuth 2.0 and OpenID Connect client
OpenID Connect and OAuth 2.0 Framework for ASP.NET Core
Helper extensions to configure Swashbuckle Swagger and Swagger UI to use OAuth implicit grant with Azure AD b2c
Azure Table Storage persistence layer for IdentityServer4
A Rest-only client for DSharpPlus.
IdentityServer3 Access Token Validation Integration Library for ASP.NET 5
ASP.NET 5 Middleware for validating scope claims
ASP.NET 5 Authentication Middleware using OAuth 2.0 Introspection (rfc7662)
A Rest-only client for DSharpPlus.
Grant Software's strong-named version of OpenID Connect & OAuth 2.0 client library
Simple authorization middleware for granular scope based authorization
Simple Oauth2 client.
Oauth2 delegation through Windows Azure Access Control Service for ASP.NET Web API.
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...
Implementation of the Hawk authentication scheme for Web API v2 and Katana.
OAuth flow for scenarios with limited access to input devices or web browsers, like console apps, or IoT devices.
Deprecated. Use the strong named ServiceStack.Authentication.OAuth2 package instead.
Entity Framework 7 persistence layer for IdentityServer3
IdentityServer3 Integration Library for ASP.NET Core
MongoDB persistence layer for IdentityServer4