antispam question for signup and comment forms of wordpress, set by admin, supports Multisite mode
Kontak is a free contact form plugin that is coded in HTML5 / CSS3 and has CAPTCHA that does not use PHP sessions. Messages are sent by email.
Use BrandCAPTCHA and monetize your CAPTCHA interactions
Let admin create a page to do automatic exchange links with other webmaster
Captcha Enjoy ile sitenizi botlardan koruyun, site içerigiyle ilgili eglenceli sorularla kullanıcılarınızı göz bozan captchalardan kurtarın.
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.
Provides a replacement for login and register and lost password and provides feature for password expiration and optional invitation codes.
An easy to modify poll system that uses Google Charts to display the results
WPshore Contact Form 7 Spam Prevention helps you manage your Inbox to keep it free of unwanted e-mail messages.
A total simple contact form with captcha, support multilinguality.
ImHuman provides more humane, fun, easy, secure and mostly user friendly captcha (are you really a human?) detection for posting comments.
Anonymous Posting plugin allows anonymous user to write their own posts using special page, no access to WP panel is needed.
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
Customize WordPress login page easily according to your theme or any other custom style with Custom Login Page Styler.
An easy and powerful form builder that lets your visitors send you email. Blocks all automated spammers. No templates to mess with.
Easiness and effectiveness are the keys for a valid Captcha control. DC generates appealing captcha for your WP blog without compromising usability.
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
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
Easy way to collect user submitted content for you blog.
Securimage-WP-REG adds captcha ptotection from Securimage-WP plugin on register pages.
A widget for the WP-invites plugin
GainURL allows to earn money without much advertising, banners and affiliate posts on the pages of your website.
Integrates μcaptcha with WordPress, including comment and login/registration forms.
This plugin helps block bogus registrations by allowing a custom registration field and answer.
An easy to modify quiz system
The ultimate plugin and service to stop and kill splogs in WordPress Multisite and BuddyPress, from WPMU DEV.
Security Captcha es un sistema para prevenir spam de cualquier tito, tanto por personas como por scripts creados por personas.
CAPTCHA in Thai language.
AdCaptcher.com enables you to build custom captchas. You need an AdCaptcher account to administrate your custom captchas.