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ASP.NET Identity - ASP.NET Identity is a membership-based software system designed for the authentication and authorization of the users via building an ASP.NET application.
OpenID - OpenID is a safe, faster and easier way to log in to web sites.
DotNetOpenAuth - DotNetOpenAuth is a free-to-use compiled library that comes with the real support to your site visitor to login with the help of openIDs via getting control of the ASP.NET control onto the page.
Portier - An email-based, passwordless authentication service that you can host yourself.
ASP.NET SAML - ASP.NET SAML is an open-source authentication utility that has been used for exchanging authentication and authorization data between the channels.
OAuth - OAuth is an open standard for authorization. It allows users to share their private resources (e.g.