AdCaptcher.com enables you to build custom captchas. You need an AdCaptcher account to administrate your custom captchas.
This plugin helps block bogus registrations by allowing a custom registration field and answer.
This plugin creates a resistor color code captcha on comment forms
Provides functions to easily display and validate a reCAPTCHA
Integrates SpamCaptcher anti-spam methods with WordPress including comment and registration spam protection.
Contact Form plugin from www.123Formular.de
This plugin is a simple captcha that appears when an unregistered user try to register or to leave a comment.
Integrates μcaptcha with WordPress, including comment and login/registration forms.
Integrates CaptchaAd anti-spam methods with WordPress including comment, registration spam protection.
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
RUH Captcha helps filtering out all robot attempts to register/comment.
Integrates a logic captcha to verify that the registrant is a human and not a spam bot instead of using distorted images or audio.
The plugin provides the next generation in captcha, BotProof Captcha 2.0, to a WordPress blog comment form. It is currently version 0.9.6.8 Beta.
Integrates NLPCaptcha anti-spam methods with WordPress including comment, registration, and email spam protection.
Adds integration with Nocaptcha Mail.Ru service - free intelligent CAPTCHA service.
Windsor Zendesk Submit Ticket Form is a clean, secure, plug-n-play ticket submission form for any Zendesk account.
Integrates yoCAPTCHA anti-spam methods with WordPress including comment, registration, and email spam protection. WPMU Compatible.
Prevent spams with hassle free captcha.
Uses CloudFlare IP Geolocation and poses the question; what is your country code?
Any contact form plugin. Simple, free and flexible.
NF Captcha adds Really Simple CAPTCHA element for human check.
Adds a CAPTCHA to account registration that uses Vidoop's ImageShield.
Adds CAPTCHA anti-spam methods to WordPress on the comment form, registration form. WPMU and BuddyPress compatible.
A plugin for displaying beautiful forms in front-end only using shortcodes. Login and Registration forms
Last modify: 04.06.2010 DD.MM.YYYY Trumpcha is a very unique jQuery ajaxed CAPTCHA plugin that requires just one click/(mouse mmovement) instead of t
Parrotify is a revolutionary anti-bot instrument.
Change default login site to a custom URL, block spam, bot registration, and brute-force using Google reCAPTCHA.
The plugin adds a fancy drag and drop (or click on mobile and tablets) captcha field to specific forms you choose by inserting the tag, classname or f
We're sorry, but BotAlert/BotBlock is no longer available.
Integrates HappyCaptcha anti-spam methods with WordPress including comment, registration, and spam protection.