The ultimate plugin and service to stop and kill splogs in WordPress Multisite and BuddyPress, from WPMU DEV.
Let admin create a page to do automatic exchange links with other webmaster
minteye - STOP SPAM, MAKE MONEY!
Captchelfie - Captcha by Selfie. Now with social capabilities.
An easy to modify poll system that uses Google Charts to display the results
Captcha Enjoy ile sitenizi botlardan koruyun, site içerigiyle ilgili eglenceli sorularla kullanıcılarınızı göz bozan captchalardan kurtarın.
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.
Moderni contact form plugin gives a WP most flexible and usable contact form.WP-admin can use either captcha or simple contact form.
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
Integrates μcaptcha with WordPress, including comment and login/registration forms.
Easiness and effectiveness are the keys for a valid Captcha control. DC generates appealing captcha for your WP blog without compromising usability.
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
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.
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
An easy and powerful form builder that lets your visitors send you email. Blocks all automated spammers. No templates to mess with.
Contact Form plugin from www.123Formular.de
This plugin helps block bogus registrations by allowing a custom registration field and answer.
Security Captcha es un sistema para prevenir spam de cualquier tito, tanto por personas como por scripts creados por personas.
Affiliates, Affiliates Pro and Affiliates Enterprise integration with the Captcha plugin.
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.
Asks the visitor making the comment to key in the disappeared chinese word. This is intended to prove that the visitor is a human being but a spam rob
This plugin is a simple captcha that appears when an unregistered user try to register or to leave a comment.
This plugin creates a resistor color code captcha on comment forms
CAPTCHA in Thai language.