StarterSTS (Codeplex) StarterSTS is a compact, easy to use security token service that is completely based on the ASP.NET provider infrastructure. It is built using the Windows Identity Foundation and supports WS-Federation., WS-Trust, REST, OpenId and Information Cards. How to: Run StarterSTS on IIS 6 / Windows 2003 An updated version of StarterSTS which conforms to the MVC model is: IdentityServer (Codeplex) IdentityServer is the follow-up project to StarterSTS. It's an easy to use security token service based on WIF, WCF and MVC 3. SelfSTS SelfSTS is a simple utility which exposes a minimal WS-Federation STS endpoint. SelfSTS can be used as a test STS when developing web sites secured with Windows Identity Foundation.
There are also some extensions to WIF: IdentityModel (Codeplex) This is a helper library that makes common tasks easier to accomplish. Useful Extensions for SecurityToken Handling Convert a security token to claims. Windows Identity Foundation Extension for OAuth (Microsoft Connect) WIF Extension for SAML 2.0 (Microsoft Connect) C# library for OAuth and OpenID support DotNetOpenAuth allows WIF developers to develop their own custom solutions.