FV Antispam is a powerful and simple antispam plugin. It moves any spambot comments directly to trash and allows Akismet to just deal with human spam.
Captcha Bank is an easy to use wordpress security plugin to prevent spam on your site while letting real people pass through with ease. It's more
This plugin enables you to use a Google reCAPTCHA contact form on your blog.
Blue Captcha is a powerful and highly customized WordPress plugin that effectively protects your WP blogs from spammers and unwanted persons.
Comment spam prevention without moderation, captchas or questions
Spam Master is the Ultimate Spam Protection plugin that blocks new user registrations and post comments with Real Time anti-spam lists.
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.
Stop spam with a fun game instead of distorted text! PlayThru works effortlessly on blog comments, registration pages, lost password forms, and more.
Plugin to reject spam. Port from same author from http://www.phpbbantispam.com Actually visits the URL from commenter to spider for spamwords.
Powerful and invisible fighter against comment spam.
MP Spam Be Gone is the simplest, most effective Spam blocker.
Write email addresses without worrying about spambots and email harvesters.
This antispam plugin provides very simple(one-click) and powerful captcha for your blog.
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)
Defensio is an advanced spam, malicious content and profanity filtering web service that learns and adapts.
Block 250+ spam sites, such as semalt.com and 4webmasters.org! Keep your website safe and your Google Analytics statistics clean and accurate.
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
Login Form with security, design and redirect features. Custom login WordPress client login website
Enhance your Gravity Forms to include anti-spam measures originally based on the work of David Walsh's "Zero Spam" technique.
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
The Advanced WordPress Security plugin Developed by World Web Arts to protect your wordpress website from virus and malicious attack by permission set
Integrates reCAPTCHA anti-spam methods with WordPress sites using BuddyPress plugin, including comment and registration spam protection.
With the release of WordPress 2.8 development of Yawasp is discontinued!!! For further protection against automated Spambots please checkout the succe
Adds Graphic Captcha Protection field for login, registration, lost password, comments pages. Perfect antispam solution for your website.
Protect your site against bad bots by trapping them in a virtual blackhole.
Add captcha to forms easily, comment form, login form, register form, rest password form, easy to use and translate ready, no spam comments!
PlusCaptcha - The Easiest Captcha to Setup and Execute, with an Auto-Setup Feature! Trusted by thousands of blog, e-commerce, and government sites!