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Computers and technology — programming languages, software, hardware, internet services, security, artificial intelligence, and more. Explore thousands of tech resources organized by a knowledgeable community of editors.
56203 resources
Explains how captcha features can keep spammers from signing up for certain accounts online, such as email or weblogs. Explains how the system can be circumvented as well.
An open source Java framework for captcha definition and site integration. Project information, documentation, issue tracker, and download.
A W3C Working Group Note explaining how CAPTCHAs can present a major obstacle to users who have limited vision or a learning disability such as dyslexia. This document examines a number of potential solutions and alternative systems.
Open source PHP script for generating image CAPTCHAs with audio alternatives. Includes documentation, a gallery and an online demonstration. [LGPL]
A captcha system that uses successful decodings to helps digitise books for online use. Background, and details on how to incorporate into a site. Source code in several languages, and plugins for popular blogging and CMS software.
Users need to roll dice and answer the question to verify they are human with this free image based service. Provides a demo, FAQs and customization options.
Includes demonstrations, research papers, and news.
Information about the CAPTCHA software for Drupal.
A source of simple textual CAPTCHA logic questions.
A jQuery plugin that requires users to sketch the shape they see in order to submit a form.
Software which doesn't require entering alpha-numeric characters via a keyboard. Plugins for popular CMS software.
Protects websites and online services from spam. Respects privacy and works automatically.