FeedCaptcha
FeedCaptcha is a new captcha system, easy to integrate and with meaning for your product.
10 Alternatives To FeedCaptcha
Confident Captcha
Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture…
MTcaptcha
Enterprise Captcha solutions
Mollom
Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your…
Negative Captcha
A plugin to make the process of creating a negative captcha in Rails much less painful
NoMoreCaptchas
What Does NoMoreCaptchas Do?
Sblam!
Open-source implementation of server-side spam filtering of blog comments and forum posts.
Securimage
Securimage is a script for generating complex images and CAPTCHA codes to protect forms from spam…
UniqPin
UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect…
phpformmailer
Easy to use - Nothing stupid your visitors have to type before the form submits.
reCAPTCHA
reCAPTCHA is a free security service that protects your websites from spam and abuse.