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www.webwiz.net/web-wiz-captcha/downloads.htm

Aug 6, 2015 ... Download Web Wiz CAPTCHA free; Protect your web forms from spam and hacking.

download.cnet.com/Internet-Captcha/3000-10247_4-10824424.html

Captchas are those squiggly, random words or numbers you type in a box to prove to a Web site that you're a human being and not another computer. The word ...

www.phpcaptcha.org/download

If you use Securimage and have found it helpful, please consider donating. The suggested contribution is $3 USD but any amount is appreciated. Donation is ...

captcha.com/captcha-download.html

Download BotDetect Captcha for free and protect your forms from bot submissions.

www.google.com/recaptcha/intro/android.html

reCAPTCHA uses an advanced risk analysis engine and adaptive CAPTCHAs to keep automated software from engaging in abusive activities on your site.

tympanus.net/codrops/2009/09/22/21-free-captcha-sources

Sep 22, 2009 ... Here is a collection of free CAPTCHA scripts and services than you can easily integrate into your website using PHP or JavaScript: 1.

www.icaptcha.com

Add this free captcha to your web page. ... Internet Captcha is designed to protect your html forms where users send information to others ... Download Here.

wordpress.org/plugins/really-simple-captcha

Download ... Really Simple CAPTCHA does not work alone and is intended to work with ... Really Simple CAPTCHA does not use PHP “Sessions” for storing states, unlike many other PHP CAPTCHA solutions, but stores them as temporary  ...

github.com/google/recaptcha

reCAPTCHA is a free CAPTCHA service that protect websites from spam and abuse. ... on the main project page to either clone the repo or download the ZIP file.

www.captcha.net

A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot.