Multiple authentication providers in ASP.NET MVC

I'm starting a new project, using ASP.NET MVC 3, and one requirement is to support multiple authentication providers, i.e. Live ID, Google, Facebook, etc. I've looked at companies that provide su开发者_StackOverflow社区ch a service, but ideally I need a free solution.

Does anyone know of a free service?

If not, the only other solution is to develop something similar to support the providers I'm interest in. Has anyone implemented such a thing? If so, can someone provide any suggestions, articles, guidence, etc, to help with this?

I don't think there is an open source library that supports all the sites out there. You may take a look at OpenId for those that support this protocol. For FaceBook you could use the Graph API.

Jainrain Engage is free for their basic accounts.

Whilst not free the Windows Azure Access Control Service provides just that You use Windows Identity Foundation in your website to point at the ACS, and configure the ACS with Live ID, Google, Yahoo ID and/or Facebook (as well as potentially any other STS)