Prevent spams with hassle free captcha.
This Plugin provides very simple and powerful captcha for your blog with wide variety of captcha methods and models.
Todd Lahman's comment spam blocking plugin that blocks automated spam with zero false positives.
This plugin will make your blog more secure by adding rules which spambots will not pass.
The Advanced WordPress Security plugin Developed by World Web Arts to protect your wordpress website from virus and malicious attack by permission set
WP True Typed is an anti-spam plugin to protect your site from comment spam.
Extremely simple, 0 configuration and 0 user/admin-interaction anti-spam plugin.
Provides better email validations to protect your blog from spam comments and bots creating accounts.
Super Simple Anti Spam for WordPress is anti spam plugin (for comments and trackbacks), while not having to moderate and / or edit a single setting.
minotaur - Rid the internet of text CAPTCHAs!
This plugin protects your registered user base by preventing registration with a disposable email addresse (like the ones provided by mailinator).
This plugin adds a new form of captcha to your Buddy Press registration and comment forms. Use this plugin to prevent bots from spamming your website
This plugin is a simple captcha that appears when an unregistered user try to register or to leave a comment.
Add Hashcash spam protection to Contact Form 7.
Keep Your Site Happy, add Khush Captcha Anti-SpamBot Technology to your WordPress Registration and Comment Forms.
minteye - STOP SPAM, MAKE MONEY!
Plug-in to hide the login page, change the url: wp-login.php and wp-admin maintaining functionality
A plugin to understand SpamDyke 's error codes
Several types of captcha to protect your site in one easy to use plugin.
Integrates CaptchaAd anti-spam methods with WordPress including comment, registration spam protection.
This is the new generation IceCaptcha plugin. The Anti-Spam security system misses no bots and does not disturb a human being.
With this plugin you can query http://www.stopforumspam.com/ database and block guest spam post (also in bbpress plugin)!
Adds a shortcode which converts email addresses to HTML entities to block spambots.
Simple plugin to prevent spam-bots registration on your site. Allows you to create an unique question, easy for humans, but not solvable for the bots.
Integrates yoCAPTCHA anti-spam methods with WordPress including comment, registration, and email spam protection. WPMU Compatible.
A simple plugin to hide emails from spambots. Simply use the shortcode [hide_email email@example.com] to hide firstname.lastname@example.org from harvesters
Integrates NLPCaptcha anti-spam methods with WordPress including comment, registration, and email spam protection.
Integrates Picatcha image-identification CAPTCHA - anti-spam solution with WordPress including comment and registration.
MASP is an advanced spam filtering web service. It can learn content and responds to incoming threats. In short, it copes with spam efficiently.