An exceptionally powerful WordPress anti-spam plugin that eliminates comment spam, trackback spam, contact form spam & registration spam.
Max power spam protection, all-in-one, premium anti-spam. No comments spam & registrations spam, no email spam, protects any forms. Forget spam.
WordPress plugin to fight with 300 referrer spammers (like semalt, buttons-for-website and many more).
Bad Behavior prevents spammers from ever delivering their junk, and in many cases, from ever reading your site in the first place.
If you see referral spam in your analytics and would like to block it, this plugin is for you.
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
The most lightweight Google reCAPTCHA v2 comment anti-spam plugin!
Simple Ajax Chat displays a fully customizable Ajax-powered chat box anywhere on your site.
Integrates μcaptcha with WordPress, including comment and login/registration forms.
Math Captcha is a 100% effective CAPTCHA for WordPress that integrates into login, registration, comments, Contact Form 7 and bbPress.
Gwolle Guestbook is the WordPress guestbook you've just been looking for. Beautiful and easy.
This plugin utilizes Google reCAPTCHA to help your blog stay clear of spams. BWP reCAPTCHA supports no CAPTCHA reCAPTCHA, Contact Form 7 and Akismet.
Kills spam dead in it's tracks. Be gone evil demon spam!
Stop spam bots from registering, logging in, filling out contact forms and commenting on your site without using annoying Captcha codes or puzzles.
Encode mailto links, email addresses, phone numbers and any text to hide them from (spam)bots. Mailto links will be protected automatically.
Blocks referer/referral spam from accessing your site and cleans up your Google Analytics in the process!
Industry leading bot detection and analytics through the use of the Ellipsis Human Presence score proprietary technology.
WordPress SuperSonic with CloudFlare
Akismet checks your comments against the Akismet Web service to see if they look like spam or not.
Block users from registering to your WordPress site with custom defined blacklists.
An extremely powerful anti-spam plugin that blocks Spam-bots without annoying captcha images.
This plugin allows you to implement Google Captcha (reCAPTCHA) into web forms.
PlusCaptcha - The Easiest Captcha to Setup and Execute, with Auto-Setup Feature! Trusted by thousands of blog, e-commerce, and government sites!
Add captcha to forms easily, comment form, login form, register form, rest password form, easy to use and translate ready, no spam comments!
Stop your website email addresses from being scraped and harvested by spammers with the best email obfuscator protection available.
A lightweight plugin to protect email addresses from email-harvesting robots by encoding them into decimal and hexadecimal entities.
Todd Lahman's comment spam blocking plugin that blocks automated spam with zero false positives.
Just ajax contact form with captcha, one shortcode and easy to use, without options and without complexity.