Shibboleth

Shibboleth is among the world's most widely deployed federated identity solutions, connecting users to applications both within and between organizations. Every software component of the Shibboleth system is free and open source.

You'll need a custom add-on and judging from your post you don't have much experiance, so you will have to pay a developer.
 
the reason I'm asking is because I don't use Shibboleth however I have been developing sites for over 20+ years. So my experience isn't in question here. I'm simply asking if any developers here that have experience with this system can point me in the right direction to decide if my client should go the xenforo route or not. Hence the pre-sale questions section of this site.
 
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