YouMe ID
The YouMe ID plugin provides two security features, i.e. an alternative CAPTCHA service and a…
Plugin Tag: captcha
Captcha Novami
Invisible and secure captcha which works in the background. No tracking of visitors.
GWP-Captcha
This is a simple captcha system. That you can setting how many letter you would…
GreCAPTCHA
Protects WordPress website forms from spam and brute-force attacks with Google reCAPTCHA.
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：