CAPTCHA is an acronym for "Completely Automatic Public Turing Test to Tell Computers and Humans Apart". It is a task, that human can easily solve, but computer not. It is intended to determine whether or not the user is human. Usually, CAPTCHA requires that the user type the letters and digits of a noised and distorted image. You do not even find analogues such scripts freely available on the Internet. Do not believe it?

Lanap BotDetect ASP.NET CAPTCHA is a website security solution designed to prevent automated registrations (spambot) with CAPTCHA image. While the code cannot be read by machine (computer program), it is easily read by a human. Key features: generates CAPTCHA image with textual code rendered in it, many different algorithms, custom size, server side component. 'Developer Edition' includes SOURCE CODE and ROYALTY FREE distribution rights!

Lanapsoft BotDetect - ASP.NET CAPTCHA is a website security component designed to protect your registration, comment, and other online forms from automated spam submissions. It generates CAPTCHA images that easily tell bots and humans apart. 50 different CAPTCHA algorithms, custom size and image format, sound support that allows access even to visually impaired! 'Developer Edition' includes FULL SOURCE CODE and ROYALTY FREE distribution rights!

Lanap BotDetect ASP CAPTCHA is a website security solution designed to prevent automated registrations with CAPTCHA image. While the code cannot be read by machine (computer program), it is easily read by a human. Key features: generates CAPTCHA image with textual code rendered in it, many different algorithms, custom size and image format, sound support! 'Developer Edition' includes FULL SOURCE CODE and ROYALTY FREE distribution rights!

Captcha Creator is a professional fully customizable PHP Script that generates Strong Captcha images. Easy to install on any hosting account, it is highly customizable, allowing you to chose everything ( image size, backgrounds, fonts, colors, code length and many more ). Great to stop automated submissions on web forms such as: Guestbooks, Blogs, Wiki, Comment, Feedback forms and other types of web forms.

ASP/Verify is a server side COM component that helps web developers prevent automated registrations.(known as CAPTCHA™).

Human Pictcha is a protection in a form of an image (a captcha), which can be embedded inside your web forms, and which will filter out various forum spam, guestbook spam, form spam, signup spam, password attacks. - For PHP or Perl forms - Easy to setup and maintain - Full open source - Compatible with the typical webserver setup - Secure and hard to defeat by OCR - You can tune it to match your website looks - Complete documentation

The Human Intelligence Identification Script is designed to prevent web forms being submitted by automated robot scripts. Automated robot scripts are used maliciously to send Form Spam and Hijack Web Forms. The Human Intelligence Identification Script only allows form processing if a correct answer to a set question is provided when the form is submitted. Hii Script is a php script requiring your server to support the php scripting language.