[url]http://wordpress.org/extend/plugins/si-captcha-for-wordpress/[/url]
[url]http://wordpress.org/extend/plugins/keycaptcha/[/url]
[url]http://wordpress.org/extend/plugins/animal-captcha[/url]
[url]http://wordpress.org/extend/plugins/ironclad-captcha-wp-plugin/[/url]
[url]http://wordpress.org/extend/plugins/cbnet-really-simple-captcha-comments/[/url]
[url]http://wordpress.org/extend/plugins/really-simple-captcha/[/url]
[url]http://wordpress.org/extend/plugins/secure-captcha/screenshots/[/url]
[url]http://wordpress.org/extend/plugins/solvemedia[/url]