Artificial intelligence
Text Disguise Web Service Text Disguise DLL, CAPTCHA-image web service offered as a single-purchase DLL
CAPTCHA-image web service for web site and .NET developers: Text Disguise
ASP.NET Control FormShield, free control for ASP.NET
New Control - FormShield - Dynamically Generates CAPTCHA™ Style Images
CAPTCHA Custom Control , a CAPTCHA Server Control for ASP.NET
A CAPTCHA Server Control for ASP.NET - The Code Project - ASP.NET
CAPTCHA Image , a .NET implementation with explanation and source code (for use with ASP.NET)
CAPTCHA Image - The Code Project - ASP.NET
Poor man's Captcha , a Classic ASP implementation using CSS, javascript and ASP.
A CAPTCHA Solution For Classic ASP
GD::SecurityImage , another Perl implementation (GD + Image::Magick).
Burak Gürsoy / GD-SecurityImage - search.cpan.org
Authen::Captcha , a Perl implementation.
Joshua I. Miller / Authen-Captcha - search.cpan.org
PhpCaptcha , PHP + GD implementation with multiple fonts and support for background images.
Downloads / Scripts
Block AutoSubmit , Implementation that works with newer and older GD down to version 1.63.
Development - Block Automated Submissions using php and image creations
CaptchaPHP , data: URLs, readable riddle in alt= for visually impaired users and not OCR-safe
freshmeat.net: Project details for Captcha PHP
GOTCHA! , yet another captcha using PHP4 + GD.
GOTCHA! - Yet Another Captcha...
tEABAG_3D CAPTCHA , by OCR Research Team. 3D captchas using PHP4 + GD.
OCR Research Team
PEAR's Text_CAPTCHA , a PHP implementation.
PEAR :: Package :: Text_CAPTCHA
Forms generation and validation class with a plug-in to implement a CAPTCHA validation input
PHP Classes - Shortcut to Forms generation and validation package page
http://www.froola.com never sleeps.
freeCap 1.4 , PHP + GD implementation with multiple fonts and hammering protection, distributed under the GPL
puremango.co.uk: Free Visual Confirmation PHP CAPTCHA script - secure guestbooks + stop spam.
tacs , and yet another PHP + GD implementation.
taCs - the Acronym CAPTCHA sucks
Auditor , yet another PHP + GD implementation.
Why guestbooks, blogs, wiki are spammed and how to prevent spam.
Image Verification , a PHP + GD implementation.
Image Verification (updated) - PHP
Image Verification Tutorial , a PHP + GD implementation on Planet Source Code
^ An Image Verification Tutorial - PHP
VeriWord , a PHP implementation.
PHP Classes - Class: VeriWord
Open Source Captcha CFC , A Free Coldfusion Captcha Component (CFC)
Compound Theory - Transfer ORM Library
The Alagad Captcha , a ColdFusion Component (CFC) written in 100% native ColdFusion.
Alagad Captcha
Proposal and source code for an audio based captcha written in Java.
Proposal for an Accessible Captcha - Standards-schmandards
The simple captcha Project , a new open-source Java implementation.
the simple java captcha project
The reCaptcha Project , a Java implementation.
reCaptcha
The JCaptcha Project , an open-source Java framework for Captcha definition and integration.
JCaptcha - jcaptcha
Python Module at captchas.net a python module for web applications using captchas from
Sample Python Implementation
Python recipe at activestate.com , a stand-alone implementation that generates its own captcha images
ASPN : Python Cookbook : Human verification test (captcha)
US Patent for Captcha , patent #6,195,698 (note: the term Captcha was not yet coined when this document was written).
United States Patent: 6,195,698
captchas.net
captchas.net
http://www.froola.com, there's no better way.
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