Top 20 NuGet oauth2 Packages

Angular Oauth2 (angular-oauth2) binding library for Bridge.NET projects.
Meteor Prime8consulting Oauth2 (meteor-prime8consulting-oauth2) binding library for Bridge.NET projects.
Handles OAuth2 code flow to get authorization tokens from OpenID Connect providers, spawning a web browser for interactive authentication as needed.
Oauth2 Server (oauth2-server) binding library for Bridge.NET projects.
ASP.NET Core OAuth2 middleware for Ecwid API v3
gRPC library compatible with .NET Core. Currently, the Grpc.Auth NuGet package doesn't support .NET Core. This package supplies a version which runs on .NET Core that is experimental and in-development.
Provides an easy-to-use interface for OIDC-dependant applications.
Class library to simplify application token retrieval from Microsoft OAuth 2.0 workflow.
EntityFramework persistence layer for IdentityServer4
dotNetDR_OAuth2中国微博API访问组件
OAuth 2.0 client for VK social network, using DotNetOpenAuth library
Enables securing of WebAPIs using OAuth2 Client Credentials Grant - See https://dev.twitter.com/docs/auth/application-only-auth
Middleware that enables an application to support mixi's OAuth authentication workflow.
Middleware that enables an application to support Yahoo Japan's OAuth 2.0 authentication workflow.
Middleware that enables an application to support Weibo's OAuth authentication workflow.
Infrastructure and configuration for building identity provider plugins for Affecto Authentication Server.
OAuth 2.0 server extensions for ASP.NET MVC 6.
A modern client for the Google Authentication API.
Dapper extension for IdentityServer3
It provides common utilities, especially OAuth2 authentication, for other Google API client libraries.