SSOCircle Uses OpenSSO to Provide an Open Identity Provider Service
By superpat on Oct 26, 2008
SSOCircle is an open identity provider that supports multiple protocols for federated single sign-on. One of the first production deployments of OpenSSO, SSOCircle went live in February 2007 with support for SAML 2.0, adding OpenID a couple of months later (see SSOCircle-related posts at Superpatterns).
If you're working with federation technologies, SSOCircle is an incredibly useful resource - in the case of SAML 2.0, you can register your service provider metadata with SSOCircle and test single sign-on from SSOCircle to your site. With OpenID, of course, this isn't necessary - just type your OpenID URL (something like http://myname.ssocircle.com/) at an OpenID relying party and you're in business.
One particularly nice feature of the site is that they have configured OpenSSO's client certificate login, so you can use a browser or smartcard certificate to authenticate, rather than username/password. Convenience!
SSOCircle's latest offering is IDPee - a white label hosted identity provider service. Currently in beta (apply here), this looks like an interesting option if you don't want to be running an identity provider in your own infrastructure.