Configure SMTP mailing in WordPress, including support for sending e-mail via SSL/TLS (such as GMail).
Perfect Paper Passwords for your WordPress blog.
Changes or removes the generator meta tag to confuse hacking scripts, etc., to provide a small, additional layer of security.
Protects Categories, Pages and Posts for specific users & anonymous visitor
Removes your WordPress version from various places.
WP Plugin Security Check checks if your WordPress plugins are 'safe'.
Add reCAPTCHA to your WordPress login form
BadPass helps to promote better password selection by warning users when they are using a common password.
Protect your forms from spam with hard to break and easy to read Secure CAPTCHA images from SecureCAPTCHA.net.
Automatically scatters invisible links to Project Honey Pot spam traps throughout your wordpress blog to help catch and stop spammers.
"Re-imagined" version of Semisecure Login that uses public and secret-key encryption to encrypt passwords when logging in.
Captcha Animal protects your user registration and comments with a test of identifying two friendly animals.
This plugin protects your WPMU signup process against spambots with a simple math question.
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