Block comment spam and fake registrations by adding the powerful CAPTCHA protection of Securimage-WP to your WordPress site.
Securimage-WP shown on a comment form
A math CAPTCHA with custom text instead of a refresh button in the Twenty Ten theme
A CAPTCHA customized to use a CSS border and margin
Admin options to control image appearance
Miscellanous options for captcha functionality and look
CAPTCHA on the registration form