The Wordfence WordPress security plugin provides free enterprise-class WordPress security, protecting your website from hacks and malware.
Take the guesswork out of WordPress security. iThemes Security offers 30+ ways to lock down WordPress in an easy-to-use WordPress security plugin.
A comprehensive, user-friendly, all in one WordPress security and firewall plugin for your site.
#1 super security anti-spam captcha plugin for WordPress forms.
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
An exceptionally powerful WordPress anti-spam plugin that eliminates comment spam, trackback spam, contact form spam & registration spam.
WordPress Website Security Protection: Firewall Security, Login Security, Database Security... Effective, Reliable, Easy to use...
A lightweight plugin to protect email addresses from email-harvesting robots by encoding them into decimal and hexadecimal entities.
Spam protection, anti-spam, all-in-one, premium plug-in. No comments spam & registrations spam, no email spam, protects any forms. Forget spam.
WP Content Copy Protection uses aggressive techniques in protecting your online content (text/source/images/video/audio) from being stolen.
Aggressive anti-spam plugin that eliminates comment spam, trackback spam, contact form spam and registration spam. Protects against malicious attacks.
Encode mailto links, email addresses, phone numbers and any text to hide them from (spam)bots. Mailto links will be protected automatically.
Limit Login Attempts for login Protection. Limit rate of login attempts and block IP temporarily. It is protecting from brute force attacks.
Protects your website against brute force login attacks using .htaccess
Simple copyright protection for your images and text.
Simple membership plugin adds membership functionality to your site. Protect members only content using content protection easily.
To protect your Blog from automated spambots, this plugin adds invisible formfields to your comment form.
A true Web Application Firewall to protect and secure WordPress.
Protects site against brute force attacks. Restrict login by IP access lists. Limit login attempts. Comprehensive control of user activity.
Images Hotlink Protection for Your WordPress Websites; Anti-Hotlinking images/photos - Extensive Plugin for Watermark Pictures and images links redire
Asks the visitor making the comment to answer a simple math question. This is intended to prove that the visitor is a human being and not a spam robot
Protect email addresses and mailto links from spambots and spamming. Easy to use without configuration.
Performs a simple but very effective test on all incoming trackbacks in order to stop trackback spam.
Adds more security for your website. Server-side scanning. Performs deep website scans of all the files. Virus/Malware detection and removal. Brutefor
REPLACEMENT of the original Simple Trackback Validation Plugin from Miachel. Performs a simple but very effective test on all incoming trackbacks in o
Protect your uploads directory to people who want to browse it. Avoid browsing of your uploads directory by adding a htaccess or index.php file.
This plugin protects your admin's login page (secure key in url).
Simple IP Ban is a lightweight ip / user agent ban plugin.
Replace the WP-version with a random string < WP 2.4/5 and eliminate WP-version > WP 2.4/5, also on Feed and style- and script-urls