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The Oauth Daemon is the open source version of the OAuth.io core. This is a background api server that runs on your own server that allow your clients to authenticate to any 70+ available OAuth provider.
SocialAuth.NET as a Security Token Service (STS). STS is a form of web endpoint which facilitates delegation of authentication requirements to a separate centralized setup. It currently authenticates users with Facebook, Yahoo, Google, MSN, Twitter, MySpace and LinkedIn.
DotNetOpenAuth provides support for your site visitors to login with their OpenIDs by just dropping an ASP.NET control onto your page. It could be customized, how OpenID will operate on your site. It supports OpenID, OAuth and Infocards authentication. User registration and Signup of your site will be handled by this library. Users having Google, Twitter ID could login in to your site without having to create their own login.