https://www.drupal.org/project/captcha A CAPTCHA is a challenge-response test most often placed within web forms to determine whether the user is human. The purpose of CAPTCHA is to block form submissions by spambots, which are automated scripts that post spam content everywhere they can. The CAPTCHA module provides this feature to ...
wordpress.org/plugins/captcha The Captcha plugin allows you to implement a super security captcha form into web forms. It protects your website from spam by means of math logic, easily understood by human beings.
simple.wikipedia.org/wiki/CAPTCHA A CAPTCHA is a test that is used to separate humans and machines. CAPTCHA stands for "Completely Automated Public Turing test to tell Computers and Humans Apart." It is normally an image test or a simple mathematics problem which a human can read or solve, but a computer cannot. It is made to ...
captcha.com/asp.net-captcha-info.html BotDetect is a kind of test that can reliably determine if the solver is human -- allowing webmasters to tell bots and humans apart. BotDetect automatically generates and grade tests that:
www.google.com/recaptcha The new reCAPTCHA is here. A significant number of your users can now attest they are human without having to solve a CAPTCHA. Instead with just a single click they’ll confirm they are not a robot.
contactform7.com/captcha Contact Form 7 allows you to insert a CAPTCHA into your contact form to prevent bots from submitting forms. Contact Form 7 utilizes Really Simple CAPTCHA as its officially-sanctioned CAPTCHA module, so you will need to install the Really Simple CAPTCHA plugin before you use CAPTCHA in your form.
https://wordpress.org/plugins/really-simple-captcha Really Simple CAPTCHA does not work alone and is intended to work with other plugins. It is originally created for Contact Form 7, however, you can use it with your own plugin.
techterms.com/definition/captcha A captcha is program used to verify that a human, rather than a computer, is entering data. Captchas are commonly seen at the end of online forms and ask the user to enter text from a distorted image.
bestwebsoft.com/products/c The Captcha plugin adds a captcha form into web pages. This captcha can be used for login, registration, password recovery, comments forms. It protects your website from spammers by means of math logic, easily understandable by human beings.
download.cnet.com/Internet-Captcha/3000-10247_4-10824424... From Daypo: Internet Captcha is designed to protect your html forms where users send information to others users or databases. A informatic robot can automatic send a lot of information saturating your system or it can send you spam continuously to publish.
captchas.net A CAPTCHA image shows a random string which the user has to type to submit a form. This is a simple problem for (seeing) humans, but a very hard problem for computers which have to use character recognition, especially, ...
searchsecurity.techtarget.com/definition/CAPTCHA A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a test, used with challenge-response systems, that's designed to differentiate humans from automated senders.
https://www.webwiz.co.uk/web-wiz-captcha Web Wiz CAPTCHA Web Wiz CAPTCHA is free security image software written in Classic ASP that displays a security image on your websites forms which only humans can read.
www.codeproject.com/Articles/8751/A-CAPTCHA-Server... A CAPTCHA control implemented as a simple, visual drag-and-drop Server Control for ASP.NET.; Author: wumpus1; Updated: 31 Jan 2007; Section: Custom Controls; Chapter: Web Development; Updated: 31 Jan 2007
www.boriel.com/en/software/plugins/captcha-plugin El Rincón de Boriel » Captcha! Plugin When I turn off Captcha, WP displays fine, including the footer of the page. When I turn Captcha on, the page abruptly ends and does not display the footer area of WP which should include the Captcha …
www.htmlgoodies.com/beyond/webmaster/toolbox/captcha... The problem with most CAPTCHA image verification implementations is that they are so annoying that they often drive humans away. As we will show in this tutorial, there are ample ways to accomplish the task without testing a user's patience and dignity.