Contact Form 7 is an excellent WordPress plugin and the CF7 reCAPTCHA Plugin makes it even more awesome by adding reCAPTCHA capabilities. In the past this functionality has been provided by a recaptcha module offered by the developer of CF7 which this plugin is based on.
The problem with the module was that it had to be copied into the modules directory every time the Contact Form 7 plugin was updated. That was not possible to manage on multiple WordPress instances.
Therefore we decided that it would be nice to have a plugin that can be installed and mantained independedly from the CF7 plugin and its modules.
We got this blog from wordpress.org for blog more information Click Here