VidoopConnect makes it easier than ever to sign up and login to your site by letting your visitors reuse their existing accounts from sites like Googl
This plug-in adds a `Login with MySpaceID' button to the login page.
Facebook Connect & Facebook WordPress sync using Facebook Graph API ... more soon
This plugin generates claimedavatar.net avatars.
Lil'Omi adds cross-site Facebook Connect support to your WordPress or BuddyPress site.
Allow user login or registration using LiberatID service. Additionally, OpenIDs for authentication of users and comments is also supported.
Allow user login or registration using Seqrly service. Additionally, OpenIDs for authentication of users and comments is also supported.
Adds link and meta tags for OpenID server delegation to your WP_HEAD.
This Plugin allows your users to easily fill out your comment forms using an hCard.
This plugin, based upon James Kelley's plugin, lets users register and log in using IDs including Facebook, OpenID, and Yahoo via PrefPass.
Allow OpenID based commenters to add their thoughts via comments on your WordPress blog. This plugin is not an OpenID server.
This plugin allows you to generate a openvatar URL complete with size, default, and border options. See the documentation for syntax and usage.
Sovay secures your identity and your WordPress site logins. Authenticate once and securely access all your sites — without password hassles.
Plugin that includes HybridAuth, manage providers config and contains documentation and snippets.
Gets the data from your NoseRub account and lets you use it on your weblog. Supernifty.