Tapcha
A gesture based CAPTCHA scheme. Integrates with Contact Form 7
Plugin Tag: captcha
Captcha Novami
Invisible and secure captcha which works in the background. No tracking of visitors.
PS PHPCaptcha WP
Simple PHP-GD based captcha to replace tracking prone systems like Google recaptcha
YouMe ID
The YouMe ID plugin provides two security features, i.e. an alternative CAPTCHA service and a…
GWP-Captcha
This is a simple captcha system. That you can setting how many letter you would…
LazyCaptcha
LazyCaptcha is a small and lazy plugin to prevent bots from spamming your comments.
Ultimate Captcha reCAPTCHA Plugin for WordPress
This is a free plugin to protect your WordPress website.
Traum Captcha
CN: 最基本的形式：
Login Captcha
This plugin used to apply/add login captcha field to wordpress login form.