Akismet checks your comments against the Akismet Web service to see if they look like spam or not.
Simple but effective plugin allows you to extensively clean up your WordPress database and optimize it without doing manual queries.
An easy and powerful form builder that lets your visitors send you email. Blocks all automated spammers. No templates to mess with.
Adds CAPTCHA anti-spam methods to WordPress on the forms for comments, registration, lost password, login, or all.
The Sucuri WordPress Security plugin is a toolset for security integrity monitoring, malware detection, audit logging and security hardening.
ManageWP is the ultimate WordPress productivity tool, allowing you to efficiently manage your websites.
The Disqus comment system replaces your WordPress comment system with your comments hosted and powered by Disqus.
No spam in comments. No captcha.
All-in-one WordPress spam protection, with NO CAPTCHAs, challenge questions or other inconvenience to site visitors.
Contact Form 7 Honeypot - Adds honeypot anti-spam functionality to CF7 forms.
Secure WordPress Website Security Protection: Firewall Security, Login Security, Database Security & Backup...
A lightweight plugin to protect email addresses from email-harvesting robots by encoding them into decimal and hexadecimal entities.
The fastest firewall plugin for WordPress.
Todd Lahman's comment spam blocking plugin that blocks automated spam with zero false positives.
Optimizes the WordPress Database after Cleaning it out
Bad Behavior prevents spammers from ever delivering their junk, and in many cases, from ever reading your site in the first place.
Search the files and database of your WordPress install for signs that may indicate that it has fallen victim to malicious hackers.
WP Clean Up can help us to clean up the wordpress database by removing "revision" "draft" "auto draft" and so on.
Defeat automated spambots (even the new 'learning' bots with dynamically named hidden fields) by adding a client side generated checkbox.
Spam protection, anti-spam, all-in-one, premium plug-in. No comments spam & users spam, no contact form & WooCommerce spam. Forget spam.
Powerful anti-spam plugin that eliminates blog comment spam. Finally, you can enjoy a spam-free WordPress blog! Includes contact form.
The Most Comprehensive and Highest-Rated Security System for WordPress (formerly the WordPress Simple Firewall).
Delete all comments from your database easily.
Aggressive anti-spam plugin that eliminates comment spam, trackback spam, contact form spam and registration spam. Protects against malicious attacks.
Sets a cookie on a random URL that is then checked when a comment is posted. If the cookie is missing the comment is marked as spam. This plugin will
A quick way to delete all pending comments. Useful for victims of spammer attacks.
Allow or disallow visitors from certain countries accessing (parts of) your website
Encode mailto links, email addresses, phone numbers and any text to hide them from (spam)bots. Mailto links will be protected automatically.
Ban users by IP, IP Range, host name, user agent and referrer url from visiting your WordPress's blog.
Math Captcha is a 100% effective CAPTCHA for WordPress that integrates into login, registration, comments, Contact Form 7 and bbPress.