For those who want to federate their applications or just want to get some SSO experience, SSOCircle provides a ready to use Identity Provider with several strong 2-factor authentication methods.
Integrate your own Service Provider by just importing meta data.

Account registration is free.

You have specific requirements? Need your own private IDP instance? Use the IDP for tests on a regular basis?  Want to have encrypted assertions or attributes? Prefer official certificates or stronger encryption strength? Try our White Label Identity Provider  or the SSOCheck service.