Akismet checks your comments against the Akismet Web service to see if they look like spam or not.
WP-Optimize is WordPress's most-installed optimization plugin. With it, you can clean up your database easily and safely, without manual queries.
An easy and powerful form builder that lets your visitors send you email. Blocks all automated spammers. No templates to mess with.
ManageWP is the ultimate WordPress productivity tool, allowing you to efficiently manage your websites.
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.
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...
Optimizes the WordPress Database after Cleaning it out
The fastest firewall plugin for WordPress.
Todd Lahman's comment spam blocking plugin that blocks automated spam with zero false positives.
Search the files and database of your WordPress install for signs that may indicate that it has fallen victim to malicious hackers.
Bad Behavior prevents spammers from ever delivering their junk, and in many cases, from ever reading your site in the first place.
WP Clean Up can help us to clean up the wordpress database by removing "revision" "draft" "auto draft" and so on.
Spam protection, anti-spam, all-in-one, premium plug-in. No comments spam & users spam, no contact form & WooCommerce spam. Forget spam.
Defeat automated spambots (even the new 'learning' bots with dynamically named hidden fields) by adding a client side generated checkbox.
The Most Comprehensive and Highest-Rated Security System for WordPress (formerly the WordPress Simple Firewall).
Powerful anti-spam plugin that eliminates blog comment spam. Finally, you can enjoy a spam-free WordPress blog! Includes contact form.
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.
Zero Spam makes blocking spam comments a cinch. Install, activate and enjoy a spam-free site. Even supports third-party plugins!