Top 20 NuGet Security Packages

Components enabling secure authentication and authorization based on popular standards such as OAuth, OpenId, OTP, SSH, RADIUS, Kerberos, and LDAP through simple, easy-to-use, and intuitive APIs.
An activity based security framework
An activity based security framework for ASP.NET MVC
A cross-platform API for authenticating users and storing their accounts.
Components for Credit Card and Electronic Check (ACH) processing via major Internet gateways. Rock-solid E-Commerce components trusted by developers world-wide.
Document-oriented entities for the OpenIddict MongoDB stores.
SAML SSO for ASP.NET Examples
SAML SSO for ASP.NET Documentation
Authorization NuGet solution based on Microsoft Identity
A simple package to work with danish social security numbers F#
Integration of GraphQL.NET validation subsystem into ASP.NET Core
This is the library for Xamarin Form to use Biometric ID to do the local authentication
Package to help developers utilize the Logon Labs SSO identity service.
ACME v2 protocol client library for .NET Standard
Implements the ACME v2 protocol for the generation of certificates using ACME-compliant certificate servers.
ASP.NET Core security middleware enabling Patreon authentication.
ASP.NET Core security middleware enabling Bitbucket authentication.
SAML SSO for ASP.NET Core Examples
SAML SSO for ASP.NET Core Documentation
ASP.NET Core security middleware enabling Automatic authentication.