OneID is an easy-to-integrate plug-in that lets your users log in with a click or tap, eliminating the need for usernames and passwords.
Enable users to log in to your site using their Credly account credentials.
InWebo strong authentication plugin for WordPress
Enables a single signon (SSO) login with Twinfield Online Accounting
This plugin allows your WordPress users to authenticate and login to Vanilla forums like Facebook Connect.
This plugin lets you implement a cookie based front-end authorization system that can be used (for example) to allow users who are logged in via an sy
Allows you to setup single sign on capabilities between your site and Zendesk. Create's user accounts on the fly, automatically logs in users.
CommunityAPI SSO provides user provisioning, authorization and single signon capabilities against CommunityAPI providers.
Alternative authentication plugin for WordPress. This plugin add several login method: LDAP login and two Single Sign-on(SSO) login method: CoSign V2,
Authenticate users using Sun's Open Single Sign On service.
This plugin, based upon James Kelley's plugin, lets users register and log in using IDs including Facebook, OpenID, and Yahoo via PrefPass.
This plugin allows you to connect your local wordpress installation to a new or existing KickApps community.