DotNetOpenAuth 

This package contains shared code for other NuGet packages, and contains no public API in and of itself.

This package contains shared code for other NuGet packages, and contains no public API in and of itself.

Increase conversion rates to your web site by lowering the bar to create an account with your site, by allowing customers to use accounts they already have with other sites, such as Google and Yahoo!

This package contains shared code for other NuGet packages, and contains no public API in and of itself.

Improve usability, reliability, conversion rates and security simultaneously by simply asking the user for permission to access their data on 3rd party services rather than asking for their password.

Enables web site visitors to log into an ASP.NET web application via popular identity providers, including Google, Yahoo!, Windows Live, Facebook, LinkedIn and Twitter.

This package contains shared code for other NuGet packages, and contains no public API in and of itself.

Functionality common to both OAuth 2.0 Clients and Authorization Servers.

Improve usability, reliability, conversion rates and security simultaneously by simply asking the user for permission to access their data on 3rd party services rather than asking for their password.

This package contains shared code for other NuGet packages, and contains no public API in and of itself.

Add OpenID 1.1/2.0, OAuth 1.0(a), & InfoCard authentication and authorization functionality for client and server applications. This allows your (web) application to issue identities or accept issued identites from other web applications, and even access your users' data on other services.

This package contains shared code for other NuGet packages, and contains no public API in and of itself.

Increase conversion rates to your web site by lowering the bar to create an account with your site, by allowing customers to use accounts they already have with other sites, such as Google and Yahoo!

This package contains shared code for other NuGet packages, and contains no public API in and of itself.

Allow your customers to take their identities from your site with them as they visit other sites that accept OpenID as relying parties. Set up single-sign-on solutions within your organization using a standards-based, accepted protocol for authentication delegation.

Protect your users' data while allowing them to programmatically access it, including from other web applications, all without disclosing their login credential with you to 3rd parties.

Allow your customers to take their identities from your site with them as they visit other sites that accept OpenID as relying parties. Set up single-sign-on solutions within your organization using a standards-based, accepted protocol for authentication delegation.

Allow your web forms or MVC web site, REST or WCF service, or any other HTTP(s) service to accept OAuth 2 access tokens as a means of authorization so your users don't have to share their password with 3rd party apps and services in order to share their data between your service and those of... More information

Protect your users' data while allowing them to programmatically access it, including from other web applications, all without disclosing their login credential with you to 3rd parties.

As an OpenID 2.0 relying party or provider, include an OAuth 1.0 access token in the same user authorization/authentication step so that the relying party may also directly access the user's data on the OpenID Provider's web service.