NotCaptcha antispam
Script for defense of your sites from bots (autoregistration, autocomments, autoposting, autosubmit and so on).
A special feature of the script is that user does not have to input any symbols. He just has to chose their correct position (turn them). Now it is quite easy to enter captcha, but bots can’t do this.
However, it is better to try it – an example of script work.
Do not do antispam like this Crazy Captcha
Download an archive with script
Plugin for Wordpress – WP-NotCaptcha
Read how to setup script on your site in file installation.txt in script archive.