Limit rate of login attempts and block ip temporarily (Up to 10 minutes). It is protecting from brute force attack. Fraud ip detection.
This plugin allows you to implement Google Captcha (reCAPTCHA) into web forms.
Max power, all-in-one, premium anti-spam. No comments spam & registrations spam, no email spam, protects any forms. Just install and forget spam.
NURCaptcha inserts a reCAPTCHA on the Register Form of your site to protect it against spambots.
An exceptionally powerful WordPress anti-spam plugin that eliminates comment spam, trackback spam, contact form spam & registration spam.
Ban users by IP, IP Range, host name, user agent and referrer url from visiting your WordPress's blog.
This blocks semalt.com, buttons-for-website.com and others with a 403 Forbidden message so that they no longer show up in your Google Analytics stats.
Prevent brute force logins on your WordPress site with Google's reCAPTCHA.
Styled user management for login, register, user profile... - optional: user chosen passwords, e-mail validation, admin approval, reCaptcha and more
Protect WooCommerce login and registration form againt spam using Google's No CAPTCHA reCAPTCHA.
Plugin allows to see how many users, guests and bots are online on the website. Also, you can see statistics on the highest number of visits.
Adds a Google No Captcha ReCaptcha checkbox to your WordPress login screen.
Simple question that blocks most spambots (and paid robots) by making them answer a common sense question
Adds some extra security to your WordPress with only one click.
Simply uses the HTTP_REFERER to determine if it's from 'Semalt', and blocks it with a nice 403 "Unauthorized" response.
Antibot is a free wordpress plugin that blocks all kinds of bad bots crawling your website.
The most advanced protection against sploggers and spam users registration, is fully WordPress,WordPress MU ,BuddyPress and bbPress 2.0 compatible
Block bots without annoying captchas. Cache friendly solution with rotating keys! Blocks comment, registration, and bbpress spam. Activate and done!
Block Semalt from crawling your website.
Anti-Captcha is a transparent spam solution that does not require any end-user interaction.
WP Engine has a custom 404 page for bots. This plugin removes that customization.
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
Stop your WordPress website from being spammed by bots and restrict it only to humans.
Keep Your Site Happy, add Khush Captcha Anti-SpamBot Technology to your WordPress Registration and Comment Forms.
SpotBot aids in controlling spam before it clutters up your server. It stops bots in their tracks before they have a chance to post or force post.
Bloquea el spam de todo tipo de robots con un captcha que es invisible para los usuarios de tu web o blog.
Integrates CaptchaAd anti-spam methods with WordPress including comment, registration spam protection.
Replytocom Controller lets remove "?replytocom" from comment reply urls and redirect bots who try to use it anyway.