Allows users to comment on your blog using the facebook credentials or the default wordpress guest credentials.
Lil'Omi adds cross-site Facebook Connect support to your WordPress or BuddyPress site.
Perfect Paper Passwords for your WordPress blog.
wp-http-digest is a WordPress plugin that enables you to store the WordPress passwords in a format that is compatible with HTTP digest authentication
A plugin for SOAP authentication using an external webservice
This plugin allows users to authenticate using a password in the URL. This is especially useful to allow feed readers to access private feeds.
Allows forcing users to register and login individually on each post or page.
The plugin allows WordPress hosts to enable federated login for their WordPress site using Windows Azure AppFabric Access Control Service (ACS) 2.0.
A plugin to authenticate users migrated from Joomla/Mambo to WordPress.
A plugin for authentication/authorisation using Cloudware City for subscription access to a WordPress installation.
Allows you to setup single sign on capabilities between your site and Zendesk. Create's user accounts on the fly, automatically logs in users.
SimpleModal Janrain Engage adds Janrain Engage (aka rpx) to your SimpleModal Login
Authenticates users through Active Directory.
This plugin protects your WPMU signup process against spambots with a simple math question.
Two-Factor Authentication login security for your WordPress site using AuthAnvil.
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