SecureContact is a drop in form for users to contact you, based on the WP Contact Form plugin by Ryan Duff. It offers enhaced security by using captcha images.
It can be implemented on a page or a post.
It currently works with WordPress 2.0+.
In order to use it, you need to have the PHP’s GD extension activated. Contact your hosting company to see whether it is activated.
Free Download: Download this wp-plugin