This plugin allows you to implement super security captcha form into web forms.
Captcha Bank is an easy to use wordpress Captcha plugin to prevent spam on your site while letting real people pass through with ease. It's more
Keep spam bots out of your site without annoying Captcha codes, puzzles or faulty blacklists. Enterprise spam protection for sites of all sizes.
The Add new recaptcha google plugin allows you to implement a super security REcaptcha form into web forms.
This antispam plugin provides very simple(one-click) and powerful captcha for your blog.