Top 20 NuGet openid Packages

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: https://docs.servicestack.net/authentication-and-authorization
EntityFramework persistence layer for Duende IdentityServer
Access token validation middleware for JWT and reference tokens issued by IdentityServer3, based on JWT 5, Owin 4 and IdentityModel 4
Base Security Provider for CloudFoundry
ASP.NET Core Identity Integration for Duende IdentityServer
EntityFramework persistence layer for Duende IdentityServer
Helper library for identity & access control in .NET 4.0/WIF and .NET 4.5 (includes MVC4 and Web API support).
OpenID Connect and OAuth 2.0 Testing-Framework for ASP.NET Core and IdentityServer4
Core library for the Rock Solid Knowledge "Dynamic Authentication Provider" product. Allows for authentication schemes to be loaded from a database during run time. Core package includes support for OpenID Connect.
Bit.Server.IdentityServer
ASP.NET Core authentication middleware for Steam.
ASP.NET Core authentication middleware for OpenID 2.0 providers.
Creates an ASP.NET Core STS application using IdentityServer4 and Identity with localisation, TOTP, personal data, Bootstrap 4
A library to add OAuth2 security to a COFRS REST Service
Generic client to use OpenID Connect over any Identity Server Solution, like WSO2, Keycloak, IdentityServer4.
ASP.NET Core Client Library for the PolicyServer Runtime API
.NET Client Library for PolicyServer Runtime API
ASP.NET Identity support for IdentityServer3
C# library for Authlete Web APIs with which you can build an authorization server and OpenID provider that complies with OAuth 2.0 and OpenID Connect.
OAuth 2.0 and OpenID Connect components. Support .NET 8.0 Support .NET 7.0 Support .NET 6.0 Support .NET Standard 2.0