WP Contact Form
An easy and powerful form builder that lets your visitors send you email. Blocks all…
Plugin-tag: captcha
PollMe
An easy to modify poll system that uses Google Charts to display the results
General Contact Form
Genaral Contact From plugin allows a wordpress admin to easily create and add contact forms…
NF Captcha
NF Captcha adds Really Simple CAPTCHA element for human check.
QuizMe
An easy to modify quiz system
ARS Reg Secure
This plugin helps block bogus registrations by allowing a custom registration field and answer.
MultiMediaMonster Fancy captcha
The plugin adds a fancy drag and drop (or click on mobile and tablets) captcha…
PS PHPCaptcha WP
Simple PHP-GD based captcha to replace tracking prone systems like Google recaptcha
TomS Vaptcha
Gesture captcha —— Easy for human, hard for robots. Protect the login, register, lostpassword and…
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：
Text Captcha For Contact Form 7
Adds a text captcha to Contact Form 7
Adaptive Login Action
Adaptive Login Form: Adjusting compromise between Comfort and Paranoia.
Login Captcha
This plugin used to apply/add login captcha field to wordpress login form.
Smart Captcha Yandex
Интеграция Yandex Smart Captcha для вашего WordPress сайта.
Comments Form Captcha
This is a very basic plugin but work efficiently. Any suggestions are welcomed and I…
Pipe Recaptcha – Spam Protection, Security Plugin for WordPress Forms
Pipe Recaptcha is funny, easy and more secure from spammers. It can be added into…
Tapcha
A gesture based CAPTCHA scheme. Integrates with Contact Form 7