Confident Captcha
Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture CAPTCHA that stops spam and bots. Download our free CAPTCHA security software today.
Solve Media's CAPTCHA TYPE-IN™
Solve Media's CAPTCHA TYPE-IN ads are an easy plug-in solution that saves your users time while making your site more secure a ...
Sblam!
Open-source implementation of server-side spam filtering of blog comments and forum posts. It's available as a free web servic ...
Negative Captcha
A negative captcha has the exact same purpose as your run-of-the-mill image captcha: To keep bots from submitting forms. Image ...
NoMoreCaptchas
What Does NoMoreCaptchas Do? NoMoreCaptchas stops bots that try to register and log in to websites, leave spam comments on blo ...
reCAPTCHA
reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio shows. About 200 million CAPTC ...
UniqPin
UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect a human or a computer oper ...
Securimage
Securimage is a script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily ...
Mollom
Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your Drupal, Wordpress and Joomla site ...
visualCaptcha
visualCaptcha is a configurable captcha solution, focusing on accessibility & simplicity, whilst maintaining security. It' ...