Protect your site against bad bots by trapping them in a virtual blackhole.
reCAPTCHA in WP comments form is an ANTISPAM tool that adds a Google reCAPTCHA to the comments form and protects your site from the spam robots threat
Blue Captcha is a powerful and highly customized WordPress plugin that effectively protects your WP blogs from spammers and unwanted persons.
This plugin enables you to use a Google reCAPTCHA contact form on your blog.
Spam Master is the Ultimate Spam Protection plugin that blocks new user registrations and post comments with Real Time anti-spam lists.
Write email addresses without worrying about spambots and email harvesters.
Integrates reCAPTCHA anti-spam methods with WordPress sites using BuddyPress plugin, including comment and registration spam protection.
An easy to use wordpress Captcha plugin to prevent spam on your site. You can use Image Captcha to protect comments and the admin panel.
This antispam plugin provides very simple(one-click) and powerful captcha for your blog.
Plugin to reject spam. Port from same author from http://www.phpbbantispam.com Actually visits the URL from commenter to spider for spamwords.
Stop spam with a fun game instead of distorted text! PlayThru works effortlessly on blog comments, registration pages, lost password forms, and more.
MP Spam Be Gone is the simplest, most effective Spam blocker.
Powerful and invisible fighter against comment spam.
WordPress plugin to fight with 500+ referrer spammers (like semalt, buttons-for-website and many more).
Light & invisible method to block auto-spam when spam comment is posted. Pings and trackbacks cheks for real backlinks.
This plugin allows WordPress to block over 95% of spam comments using a time-based hash.
This plugin removes all HTML tags, BBCode tags and links from added comments (including link to author's website)
Enhance your Gravity Forms to include anti-spam measures originally based on the work of David Walsh's "Zero Spam" technique.
Block 250+ spam sites, such as semalt.com and 4webmasters.org! Keep your website safe and your Google Analytics statistics clean and accurate.
Anti-spam check the robots by behavior. No captcha. Antispam let robots do so as a human can't do.
Defensio is an advanced spam, malicious content and profanity filtering web service that learns and adapts.
Widget with simple and secure contact form.
Add captcha to forms easily, comment form, login form, register form, rest password form, easy to use and translate ready, no spam comments!
Stop spam with a fun, fast mini-game CAPTCHA! FunCaptcha is free, and works on every desktop and mobile device. For BuddyPress, Ninja Forms, Gravity F
Adds Graphic Captcha Protection field for login, registration, lost password, comments pages. Perfect antispam solution for your website.
The whole idea to this plugin is to keep spammer robots from posting on your blog, reducing the space taken by spam messages in the database, and prev
With the release of WordPress 2.8 development of Yawasp is discontinued!!! For further protection against automated Spambots please checkout the succe
Captcha Booster is #1 super security anti-spam captcha plugin for WordPress forms that protects you from spam, bots or automated scripts.