title: OpenID Connect providers
body: <p>We currently have an OpenID based Google AppEngine application. </p>
  
  <p>We are now trying to integrate our application with our customers inhouse IT systems and see,hat OpenID is a quite complicated spec to implement.</p>
  
  <p>We also see, that Google is moving in the direction of OpenID Connect (if you look at Google Drive).</p>
  
  <p>Is there any other well known public OpenID Connect provider beside Google?</p>