minteye - STOP SPAM, MAKE MONEY!
NURCaptcha inserts a reCAPTCHA on the Register Form of your site to protect it against spambots.
PlusCaptcha - No more spam! Save the ecology! The world's first interactive captcha. Balance between design and safety.
Todd Lahman's comment spam blocking plugin that blocks automated spam with zero false positives.
Asks commenters to complete a simple CAPTCHA if they don't have a previously approved comment, or if Akismet thinks their comment is spam.
This plugin utilizes reCAPTCHA (with support for Akismet) to help your blog stay clear of spams.
Allows more control over site registration by adding managed groups of invitation codes.
Block users using blacklists domain from registering to your WordPress site.
The most advanced protection against sploggers and spam users registration, is fully WordPress, WordPress MU, BuddyPress and bbPress 2.0 compatible
Blue Captcha is a powerful and highly customized WordPress plugin that effectively protects your WP blogs from spammers and unwanted persons.
Simple and cool login widget for your WordPress! AJAX, support SSL, show avatar, profile button, register and lost password forms...
Flexible way to inject captca for forms on site.
Several types of captcha to protect your site in one easy to use plugin.
Contact form with captcha plugin allows you to use a Google reCAPTCHA contact form on your blog. It requires PHP 5.0 or later.
Add reCAPTCHA to your WordPress login form
RSS link for this tag.