Top 20 NuGet oauth2 Packages

OpenID Connect & OAuth 2.0 client library
ASP.NET Core 2.0 Middleware for validating tokens using OAuth 2.0 introspection
Package Description
OpenID Connect and OAuth 2.0 Framework for ASP.NET Core
ASP.NET Core authentication handler to validate JWT and reference tokens from IdentityServer4
Chilkat .NET Class Library (64-bit) for SSH/SFTP, FTP, POP3, SMTP, IMAP, SSL/TLS, Zip, REST, OAuth2, HTTP, RSA, XML DSig, Encryption, Compression, XML, Socket, XMP, HTML to XML, JSON, JWT, OAuth1, conversion, PKCS12/PFX, Java Keystore, ASN.1, PEM, ECC, Async, ...
Package Description
EntityFramework persistence layer for IdentityServer4
ASP.NET Core Identity Integration for IdentityServer4
ASP.NET Identity support for IdentityServer3 repackaged as a dll client library, preventing the addition of volatile source code to the destination project
A simple authentication filter for WebApi that supports azure ad b2c
Access token validation middleware for JWT and reference tokens issued by IdentityServer3.
ASP.NET Core External Security Provider for CloudFoundry
ASP.NET Core Middleware for validating scope claims
.NetStandard library for accessing easily Azure AD/B2C secured API's via Oauth2 and getting information via the Graph Api
IPP .NET SDK for OAuth2 is a set of .NET classes that make it easier to make Oauth2 calls. Refer more details on the lib dependencies here- .Net Framework 4.6.1 Newtonsoft.Json (>=11.0.2)
IdentityServer is a framework and a hostable component that allows implementing single sign-on and access control for modern web applications and APIs using protocols like OpenID Connect and OAuth2. It supports a wide range of clients like mobile, web, SPAs and desktop applications and is extensible...
Access token validation middleware for JWT and reference tokens issued by IdentityServer3, based on JWT 5, Owin 4 and IdentityModel 3
Helper library for identity & access control in .NET 4.0/WIF and .NET 4.5 (includes MVC4 and Web API support).
Secure Token Service, IdentityBase web interface