Visual Captcha Grails is a Grails taglib port of visualCaptcha https://github.com/emotionLoop/visualCaptcha
Port originally based its source on the php implementation https://github.com/emotionLoop/visualCaptcha-PHP, This later changed form when Grails best practices started to be applied. This project is still in its infancy, and is yet to be fully working. Checkback later for updates.