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.
Beautiful forms in 60 seconds. The WordPress form builder that enables you to create forms with a simple drag-and-drop interface and in-place editing.
Adds CAPTCHA anti-spam methods to WordPress on the forms for comments, registration, lost password, login, or all.
The Disqus comment system replaces your WordPress comment system with your comments hosted and powered by Disqus.
The Sucuri WordPress Security plugin is a security toolset for security integrity monitoring, malware detection and security hardening.
“…another popular solution to fight spam is Antispam Bee”—Matt Mullenweg, Q&A WordCamp Europe 2014
ManageWP is the ultimate WordPress productivity tool, allowing you to efficiently manage your websites.
An exceptionally powerful WordPress anti-spam plugin that eliminates comment spam, trackback spam, contact form spam & registration spam.
No spam in comments. No captcha.
Contact Form 7 Honeypot - Adds honeypot anti-spam functionality to CF7 forms.
WordPress Website Security Protection: Firewall Security, Login Security, Database Security... Effective, Reliable, Easy to use...
The CloudFlare WordPress Plugin ensures your WordPress blog is running optimally on the CloudFlare platform.
Todd Lahman's comment spam blocking plugin that blocks automated spam with zero false positives.
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.
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.
Optimizes the WordPress Database after Cleaning it out
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.
Powerful anti-spam plugin that eliminates blog comment spam. Finally, you can enjoy a spam-free WordPress blog! Includes contact form.
Spam protection plug-in, all-in-one, premium anti-spam. No comments spam & registrations spam, no email spam, protects any forms. Forget spam.
The Most Comprehensive and Highest-Rated Security System for WordPress (formerly the WordPress Simple Firewall).
Aggressive anti-spam plugin that eliminates comment spam, trackback spam, contact form spam and registration spam. Protects against malicious attacks.
A quick way to delete all pending comments. Useful for victims of spammer 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
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.