This plugin will warn you if you're using or installing a knew as vulnerable extension or removed from official repository, a security must have plugin!
The Email Spam Protection Plugin is an easy-to-use and configuration-free plug-in to protect email addresses from automatically collecting by spam bots.
Secure your WordPress membership site by detecting compromised passwords, and blocking password sharing. The PasswordSentry Plugin integrates the Password Sentry App into the WordPress (WP) environment to track logins.
Asks the visitor making the comment to key in the disappeared chinese word. This is intended to prove that the visitor is a human being but a spam robot.