BotBouncer.com is a CAPTCHA service for OpenIDs. We provide an API for finding out if a user has filled out our CAPTCHA. We also provide a simple mechanism for OpenID enabled sites to send their users over here to fill out our CAPTCHA.
Uses the reCAPTCHA web service to improve the CAPTCHA system and protect email addresses.
The CAPTCHA Pack module contains several CAPTCHA types for use with the CAPTCHA module. The CAPTCHA Pack module is meant to provide lightweight, yet effective alternatives for the traditional image CAPTCHA, which is undesirable in certain situation (e.g. bandwidth restrictions, cpu restrictions, accessibility constraints, etc).
js-gott john erklärt, wie das greasemonkey-script zum captcha lösen funktioniert
welche captcha sind knackbar?
Empolying CAPTCHAs to use humans as the better OCR-programs
Empolying CAPTCHAs to use humans as the better OCR-programs