Google reCaptcha integration for Jetpack contact forms
Let admin create a page to do automatic exchange links with other webmaster
Captchelfie - Captcha by Selfie. Now with social capabilities.
Easiness and effectiveness are the keys for a valid Captcha control. DC generates appealing captcha for your WP blog without compromising usability.
minteye - STOP SPAM, MAKE MONEY!
Moderni contact form plugin gives a WP most flexible and usable contact form.WP-admin can use either captcha or simple contact form.
Integrates μcaptcha with WordPress, including comment and login/registration forms.
WP reCaptcha authenticate the visitor is a human verifying by Google ReCaptcha
Captcha Enjoy ile sitenizi botlardan koruyun, site içerigiyle ilgili eglenceli sorularla kullanıcılarınızı göz bozan captchalardan kurtarın.
A new captcha system that uses simple question based questions instead of the other complicated image based systems. It also uses a IP/Bot monitor tha
WPshore Contact Form 7 Spam Prevention helps you manage your Inbox to keep it free of unwanted e-mail messages.
ImHuman provides more humane, fun, easy, secure and mostly user friendly captcha (are you really a human?) detection for posting comments.
防止垃圾评论插件,点击正确的图形提交评论,仿"Clickcha"(Click on the Right picture to submit comments,to prevent spam comme
An easy to modify poll system that uses Google Charts to display the results
The ultimate plugin and service to stop and kill splogs in WordPress Multisite and BuddyPress, from WPMU DEV.
Securimage-WP-REG adds captcha ptotection from Securimage-WP plugin on register pages.
Anonymous Posting plugin allows anonymous user to write their own posts using special page, no access to WP panel is needed.
Contact Form plugin from www.123Formular.de
A widget for the WP-invites plugin
How to make your audience read more and Protect your blog form spam?. By displaying extracts from blog posts or simple messages in a CAPTCHA alternati
This plugin adds Google reCAPTCHA to forms of your WordPress site and protect it from spam and abuse.
This plugin helps block bogus registrations by allowing a custom registration field and answer.
Easy to use contact form with captcha
Affiliates, Affiliates Pro and Affiliates Enterprise integration with the Captcha plugin.
Security Captcha es un sistema para prevenir spam de cualquier tito, tanto por personas como por scripts creados por personas.
Lightweight package of several minor improvements for your WordPress. Why to install several plugins? You can have just this one.
An easy to modify quiz system
AdCaptcher.com enables you to build custom captchas. You need an AdCaptcher account to administrate your custom captchas.
Easy way to collect user submitted content for you blog.
This plugin is a simple captcha that appears when an unregistered user try to register or to leave a comment.