XenSSO - XenForo Single Sign On (version 1.0.2) - Automatically synchronizes a users authentication state across all your forums.
XenSSO at it's core allows your users to sign up once, then sign in across all your sites with that one login. It uses OpenID under the hood and some custom tailoring for some additional features not covered by OpenID.
- Single Sign On, of course
- Automatic authentication when you visit a sister site
- Username / Email validation checks your SSO database
- Synchronisation Tool
- Works entirely in the background (ie. doesn't require a manual to use).