Top 20 NuGet identity Packages

Interfaces and shared code for Okta's SDKs.
Official .NET SDK for the Okta Authentication API.
SAML 2.0 (SAML2P) service provider authentication handler. To purchase a license or get a demo license, contact sales@identityserver.com.
OpenID Connect & OAuth 2.0 client library
Mongo based identity framework for Asp.Net Core
ASP.NET Core authentication handler for validating tokens using OAuth 2.0 introspection
The ITfoxtec.Identity.Saml2 package adds SAML-P support for both Identity Provider (IdP) and Relying Party (RP) on top of the SAML 2.0 functionality implemented in .NET. Support .NET 5.0 Support .NET Core 3.1 Support .NET Standard 2.1 Support .NET Framework 4.6.1 and 4.7.2...
Simplifies using Amazon Cognito as a membership storage solution for building ASP.NET Core web applications using ASP.NET Core Identity.
Entity Framework layer for the administration of the Asp.Net Core Identity and IdentityServer4
Business Logic layer for the administration of the Asp.Net Core Identity and IdentityServer4
Business Logic layer for the administration of the IdentityServer4
Abp.ZeroCore.IdentityServer4.vNext.EntityFrameworkCore
Abp.ZeroCore.IdentityServer4.vNext
Library of core security framework for implementing role-based security with integrated Active Directory, local account and database style authentication across various .NET application types.
ASP.NET MVC Core is supported by the ITfoxtec Identity SAML2 MVC Core package which helps to integrate the ITfoxtec SAML 2.0 package and add support for SAML-P and SAML 2.0 tokens. Support .NET 5.0 Support .NET Core 3.1 Support .NET Framework 4.6.1 and 4.7.2
gRPC services for the Google Identity and Access Management API. This library is typically used as a dependency for other API client libraries.
This is the implementation of the Azure SDK Client Library for Azure Identity
OpenID Connect and OAuth 2.0 Framework for ASP.NET Core
Abp.ZeroCore.EntityFrameworkCore
Provides Managed Service Identity Management (Fluent) capabilities for Microsoft Azure.