WordPress 2-step Verification
Keyring
Block-Spam-By-Math
Root Cookie
Shibboleth
Yubikey-plugin
One-Time Password
No Disposable Email
External DB Authentication
Duo Two-Factor Authentication
WpDirAuth
Mozilla Persona (BrowserID)
Login For Google Apps
Authentication By LoginRadius
Simple LDAP Login
Block Spam By Math Reloaded
Janrain Social Login
Active Directory Integration
Clef Two-Factor Authentication
Email Login
OpenID
Google Authenticator
WP-Members Membership Plugin
Limit Login Attempts
